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/**
* Transforms a position from window to eye coordinates.
* The transform from window to normalized device coordinates is done using components
* of (@link czm_viewport} and {@link czm_viewportTransformation} instead of calculating
* the inverse of <code>czm_viewportTransformation</code>. The transformation from
* normalized device coordinates to clip coordinates is done using <code>positionWC.w</code>,
* which is expected to be the scalar used in the perspective divide. The transformation
* from clip to eye coordinates is done using {@link czm_inverseProjection}.
*
* @name czm_windowToEyeCoordinates
* @glslFunction
*
* @param {vec4} fragmentCoordinate The position in window coordinates to transform.
*
* @returns {vec4} The transformed position in eye coordinates.
*
* @see czm_modelToWindowCoordinates
* @see czm_eyeToWindowCoordinates
* @see czm_inverseProjection
* @see czm_viewport
* @see czm_viewportTransformation
*
* @example
* vec4 positionEC = czm_windowToEyeCoordinates(gl_FragCoord);
*/
vec4 czm_windowToEyeCoordinates(vec4 fragmentCoordinate)
{
float x = 2.0 * (fragmentCoordinate.x - czm_viewport.x) / czm_viewport.z - 1.0;
float y = 2.0 * (fragmentCoordinate.y - czm_viewport.y) / czm_viewport.w - 1.0;
float z = (fragmentCoordinate.z - czm_viewportTransformation[3][2]) / czm_viewportTransformation[2][2];
vec4 q = vec4(x, y, z, 1.0);
q /= fragmentCoordinate.w;
q = czm_inverseProjection * q;
return q;
}
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12 entries across 12 versions & 1 rubygems