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336 lines
11 KiB
336 lines
11 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its contributors may be used to endorse or promote products derived |
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// from this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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#ifndef INCLUDED_IMF_ENVMAP_H |
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#define INCLUDED_IMF_ENVMAP_H |
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//----------------------------------------------------------------------------- |
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// |
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// Environment maps |
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// |
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// Environment maps define a mapping from 3D directions to 2D |
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// pixel space locations. Environment maps are typically used |
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// in 3D rendering, for effects such as quickly approximating |
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// how shiny surfaces reflect their environment. |
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// |
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// Environment maps can be stored in scanline-based or in tiled |
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// OpenEXR files. The fact that an image is an environment map |
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// is indicated by the presence of an EnvmapAttribute whose name |
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// is "envmap". (Convenience functions to access this attribute |
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// are defined in header file ImfStandardAttributes.h.) |
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// The attribute's value defines the mapping from 3D directions |
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// to 2D pixel space locations. |
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// |
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// This header file defines the set of possible EnvmapAttribute |
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// values. |
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// |
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// For each possible EnvmapAttribute value, this header file also |
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// defines a set of convienience functions to convert between 3D |
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// directions and 2D pixel locations. |
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// |
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// Most of the convenience functions defined below require a |
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// dataWindow parameter. For scanline-based images, and for |
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// tiled images with level mode ONE_LEVEL, the dataWindow |
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// parameter should be set to the image's data window, as |
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// defined in the image header. For tiled images with level |
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// mode MIPMAP_LEVELS or RIPMAP_LEVELS, the data window of the |
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// image level that is being accessed should be used instead. |
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// (See the dataWindowForLevel() methods in ImfTiledInputFile.h |
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// and ImfTiledOutputFile.h.) |
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// |
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//----------------------------------------------------------------------------- |
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#include "ImathBox.h" |
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#include "ImfNamespace.h" |
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#include "ImfExport.h" |
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OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER |
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//-------------------------------- |
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// Supported environment map types |
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//-------------------------------- |
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enum Envmap |
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{ |
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ENVMAP_LATLONG = 0, // Latitude-longitude environment map |
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ENVMAP_CUBE = 1, // Cube map |
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NUM_ENVMAPTYPES // Number of different environment map types |
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}; |
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//------------------------------------------------------------------------- |
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// Latitude-Longitude Map: |
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// |
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// The environment is projected onto the image using polar coordinates |
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// (latitude and longitude). A pixel's x coordinate corresponds to |
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// its longitude, and the y coordinate corresponds to its latitude. |
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// Pixel (dataWindow.min.x, dataWindow.min.y) has latitude +pi/2 and |
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// longitude +pi; pixel (dataWindow.max.x, dataWindow.max.y) has |
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// latitude -pi/2 and longitude -pi. |
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// |
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// In 3D space, latitudes -pi/2 and +pi/2 correspond to the negative and |
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// positive y direction. Latitude 0, longitude 0 points into positive |
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// z direction; and latitude 0, longitude pi/2 points into positive x |
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// direction. |
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// |
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// The size of the data window should be 2*N by N pixels (width by height), |
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// where N can be any integer greater than 0. |
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//------------------------------------------------------------------------- |
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namespace LatLongMap |
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{ |
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//---------------------------------------------------- |
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// Convert a 3D direction to a 2D vector whose x and y |
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// components represent the corresponding latitude |
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// and longitude. |
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//---------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V2f latLong (const IMATH_NAMESPACE::V3f &direction); |
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//-------------------------------------------------------- |
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// Convert the position of a pixel to a 2D vector whose |
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// x and y components represent the corresponding latitude |
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// and longitude. |
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//-------------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V2f latLong (const IMATH_NAMESPACE::Box2i &dataWindow, |
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const IMATH_NAMESPACE::V2f &pixelPosition); |
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//------------------------------------------------------------- |
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// Convert a 2D vector, whose x and y components represent |
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// longitude and latitude, into a corresponding pixel position. |
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//------------------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V2f pixelPosition (const IMATH_NAMESPACE::Box2i &dataWindow, |
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const IMATH_NAMESPACE::V2f &latLong); |
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//----------------------------------------------------- |
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// Convert a 3D direction vector into a corresponding |
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// pixel position. pixelPosition(dw,dir) is equivalent |
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// to pixelPosition(dw,latLong(dw,dir)). |
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//----------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V2f pixelPosition (const IMATH_NAMESPACE::Box2i &dataWindow, |
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const IMATH_NAMESPACE::V3f &direction); |
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//-------------------------------------------------------- |
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// Convert the position of a pixel in a latitude-longitude |
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// map into a corresponding 3D direction. |
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//-------------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V3f direction (const IMATH_NAMESPACE::Box2i &dataWindow, |
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const IMATH_NAMESPACE::V2f &pixelPosition); |
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} |
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//-------------------------------------------------------------- |
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// Cube Map: |
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// |
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// The environment is projected onto the six faces of an |
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// axis-aligned cube. The cube's faces are then arranged |
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// in a 2D image as shown below. |
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// |
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// 2-----------3 |
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// / /| |
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// / / | Y |
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// / / | | |
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// 6-----------7 | | |
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// | | | | |
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// | | | | |
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// | 0 | 1 *------- X |
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// | | / / |
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// | | / / |
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// | |/ / |
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// 4-----------5 Z |
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// |
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// dataWindow.min |
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// / |
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// / |
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// +-----------+ |
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// |3 Y 7| |
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// | | | |
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// | | | |
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// | ---+---Z | +X face |
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// | | | |
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// | | | |
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// |1 5| |
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// +-----------+ |
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// |6 Y 2| |
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// | | | |
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// | | | |
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// | Z---+--- | -X face |
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// | | | |
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// | | | |
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// |4 0| |
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// +-----------+ |
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// |6 Z 7| |
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// | | | |
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// | | | |
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// | ---+---X | +Y face |
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// | | | |
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// | | | |
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// |2 3| |
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// +-----------+ |
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// |0 1| |
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// | | | |
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// | | | |
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// | ---+---X | -Y face |
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// | | | |
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// | | | |
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// |4 Z 5| |
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// +-----------+ |
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// |7 Y 6| |
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// | | | |
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// | | | |
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// | X---+--- | +Z face |
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// | | | |
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// | | | |
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// |5 4| |
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// +-----------+ |
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// |2 Y 3| |
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// | | | |
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// | | | |
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// | ---+---X | -Z face |
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// | | | |
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// | | | |
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// |0 1| |
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// +-----------+ |
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// / |
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// / |
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// dataWindow.max |
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// |
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// The size of the data window should be N by 6*N pixels |
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// (width by height), where N can be any integer greater |
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// than 0. |
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// |
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//-------------------------------------------------------------- |
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//------------------------------------ |
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// Names for the six faces of the cube |
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//------------------------------------ |
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enum CubeMapFace |
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{ |
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CUBEFACE_POS_X, // +X face |
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CUBEFACE_NEG_X, // -X face |
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CUBEFACE_POS_Y, // +Y face |
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CUBEFACE_NEG_Y, // -Y face |
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CUBEFACE_POS_Z, // +Z face |
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CUBEFACE_NEG_Z // -Z face |
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}; |
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namespace CubeMap |
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{ |
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//--------------------------------------------- |
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// Width and height of a cube's face, in pixels |
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//--------------------------------------------- |
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IMF_EXPORT |
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int sizeOfFace (const IMATH_NAMESPACE::Box2i &dataWindow); |
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//------------------------------------------ |
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// Compute the region in the environment map |
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// that is covered by the specified face. |
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//------------------------------------------ |
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IMF_EXPORT |
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IMATH_NAMESPACE::Box2i dataWindowForFace (CubeMapFace face, |
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const IMATH_NAMESPACE::Box2i &dataWindow); |
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//---------------------------------------------------- |
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// Convert the coordinates of a pixel within a face |
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// [in the range from (0,0) to (s-1,s-1), where |
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// s == sizeOfFace(dataWindow)] to pixel coordinates |
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// in the environment map. |
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//---------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V2f pixelPosition (CubeMapFace face, |
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const IMATH_NAMESPACE::Box2i &dataWindow, |
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IMATH_NAMESPACE::V2f positionInFace); |
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//-------------------------------------------------------------- |
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// Convert a 3D direction into a cube face, and a pixel position |
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// within that face. |
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// |
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// If you have a 3D direction, dir, the following code fragment |
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// finds the position, pos, of the corresponding pixel in an |
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// environment map with data window dw: |
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// |
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// CubeMapFace f; |
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// V2f pif, pos; |
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// |
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// faceAndPixelPosition (dir, dw, f, pif); |
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// pos = pixelPosition (f, dw, pif); |
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// |
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//-------------------------------------------------------------- |
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IMF_EXPORT |
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void faceAndPixelPosition (const IMATH_NAMESPACE::V3f &direction, |
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const IMATH_NAMESPACE::Box2i &dataWindow, |
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CubeMapFace &face, |
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IMATH_NAMESPACE::V2f &positionInFace); |
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// -------------------------------------------------------- |
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// Given a cube face and a pixel position within that face, |
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// compute the corresponding 3D direction. |
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// -------------------------------------------------------- |
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IMF_EXPORT |
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IMATH_NAMESPACE::V3f direction (CubeMapFace face, |
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const IMATH_NAMESPACE::Box2i &dataWindow, |
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const IMATH_NAMESPACE::V2f &positionInFace); |
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} |
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OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT |
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#endif
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