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/**
* Transforms a position from eye to window coordinates. The transformation
* from eye to clip coordinates is done using {@link czm_projection}.
* The transform from normalized device coordinates to window coordinates is
* done using {@link czm_viewportTransformation}, which assumes a depth range
* of <code>near = 0</code> and <code>far = 1</code>.
* <br /><br />
* This transform is useful when there is a need to manipulate window coordinates
* in a vertex shader as done by {@link BillboardCollection}.
*
* @name czm_eyeToWindowCoordinates
* @glslFunction
*
* @param {vec4} position The position in eye coordinates to transform.
*
* @returns {vec4} The transformed position in window coordinates.
*
* @see czm_modelToWindowCoordinates
* @see czm_projection
* @see czm_viewportTransformation
* @see BillboardCollection
*
* @example
* vec4 positionWC = czm_eyeToWindowCoordinates(positionEC);
*/
vec4 czm_eyeToWindowCoordinates(vec4 positionEC)
{
vec4 q = czm_projection * positionEC; // clip coordinates
q.xyz /= q.w; // normalized device coordinates
q.xyz = (czm_viewportTransformation * vec4(q.xyz, 1.0)).xyz; // window coordinates
return q;
}
Version data entries
12 entries across 12 versions & 1 rubygems