//This file is automatically rebuilt by the Cesium build process.
|
export default "/**\n\
|
* Translates a position (or any <code>vec3</code>) that was encoded with {@link EncodedCartesian3},\n\
|
* and then provided to the shader as separate <code>high</code> and <code>low</code> bits to\n\
|
* be relative to the eye. As shown in the example, the position can then be transformed in eye\n\
|
* or clip coordinates using {@link czm_modelViewRelativeToEye} or {@link czm_modelViewProjectionRelativeToEye},\n\
|
* respectively.\n\
|
* <p>\n\
|
* This technique, called GPU RTE, eliminates jittering artifacts when using large coordinates as\n\
|
* described in {@link http://help.agi.com/AGIComponents/html/BlogPrecisionsPrecisions.htm|Precisions, Precisions}.\n\
|
* </p>\n\
|
*\n\
|
* @name czm_translateRelativeToEye\n\
|
* @glslFunction\n\
|
*\n\
|
* @param {vec3} high The position's high bits.\n\
|
* @param {vec3} low The position's low bits.\n\
|
* @returns {vec3} The position translated to be relative to the camera's position.\n\
|
*\n\
|
* @example\n\
|
* attribute vec3 positionHigh;\n\
|
* attribute vec3 positionLow;\n\
|
*\n\
|
* void main()\n\
|
* {\n\
|
* vec4 p = czm_translateRelativeToEye(positionHigh, positionLow);\n\
|
* gl_Position = czm_modelViewProjectionRelativeToEye * p;\n\
|
* }\n\
|
*\n\
|
* @see czm_modelViewRelativeToEye\n\
|
* @see czm_modelViewProjectionRelativeToEye\n\
|
* @see czm_computePosition\n\
|
* @see EncodedCartesian3\n\
|
*/\n\
|
vec4 czm_translateRelativeToEye(vec3 high, vec3 low)\n\
|
{\n\
|
vec3 highDifference = high - czm_encodedCameraPositionMCHigh;\n\
|
vec3 lowDifference = low - czm_encodedCameraPositionMCLow;\n\
|
\n\
|
return vec4(highDifference + lowDifference, 1.0);\n\
|
}\n\
|
";
|
