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44 lines
2.6 KiB
GLSL
44 lines
2.6 KiB
GLSL
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2024 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#define VOLUME_PI 3.14159265358979323846 /* pi */
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#define VOLUME_SQRT1_3 0.57735026919 /* 1/sqrt(3) */
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vec3 volume_cartesianToSpherical(vec3 zeroToOneCoords) {
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// Put cartesian in [-1..1] range first
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vec3 cartesian = vec3(-1.0,-1.0,-1.0) + zeroToOneCoords * 2.0f;
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float r = length(cartesian);
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float theta = 0.0;
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float phi = 0.0;
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if (r != 0.0) {
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theta = acos(cartesian.z / r) / VOLUME_PI;
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phi = (VOLUME_PI + atan(cartesian.y, cartesian.x)) / (2.0 * VOLUME_PI);
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}
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return vec3(r, theta, phi);
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}
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