Sha256: c961ada7fc9100c963336fa12696a03bbe69e6847aca685273cd7d2b3748de0e
Contents?: true
Size: 1.49 KB
Versions: 12
Compression:
Stored size: 1.49 KB
Contents
/**
* Transforms a position from model to window coordinates. The transformation
* from model to clip coordinates is done using {@link czm_modelViewProjection}.
* 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}.
* <br /><br />
* This function should not be confused with {@link czm_viewportOrthographic},
* which is an orthographic projection matrix that transforms from window
* coordinates to clip coordinates.
*
* @name czm_modelToWindowCoordinates
* @glslFunction
*
* @param {vec4} position The position in model coordinates to transform.
*
* @returns {vec4} The transformed position in window coordinates.
*
* @see czm_eyeToWindowCoordinates
* @see czm_modelViewProjection
* @see czm_viewportTransformation
* @see czm_viewportOrthographic
* @see BillboardCollection
*
* @example
* vec4 positionWC = czm_modelToWindowCoordinates(positionMC);
*/
vec4 czm_modelToWindowCoordinates(vec4 position)
{
vec4 q = czm_modelViewProjection * position; // 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