Sha256: 346720aed488c82566ca8b1031be1d1bd5834b332b07cba4130e817654f20234
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Size: 1.28 KB
Versions: 9
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Stored size: 1.28 KB
Contents
attribute vec3 position;
uniform vec3 u_radii;
varying vec3 v_positionEC;
void main()
{
// In the vertex data, the cube goes from (-1.0, -1.0, -1.0) to (1.0, 1.0, 1.0) in model coordinates.
// Scale to consider the radii. We could also do this once on the CPU when using the BoxGeometry,
// but doing it here allows us to change the radii without rewriting the vertex data, and
// allows all ellipsoids to reuse the same vertex data.
vec4 p = vec4(u_radii * position, 1.0);
v_positionEC = (czm_modelView * p).xyz; // position in eye coordinates
gl_Position = czm_modelViewProjection * p; // position in clip coordinates
// With multi-frustum, when the ellipsoid primitive is positioned on the intersection of two frustums
// and close to terrain, the terrain (writes depth) in the closest frustum can overwrite part of the
// ellipsoid (does not write depth) that was rendered in the farther frustum.
//
// Here, we clamp the depth in the vertex shader to avoid being overwritten; however, this creates
// artifacts since some fragments can be alpha blended twice. This is solved by only rendering
// the ellipsoid in the closest frustum to the viewer.
gl_Position.z = clamp(gl_Position.z, gl_DepthRange.near, gl_DepthRange.far);
}
Version data entries
9 entries across 9 versions & 1 rubygems