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