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uniform mat4 ModelViewMatrix;
uniform mat4 ProjectionMatrix;
uniform float pixel_size;
uniform float size;
in vec3 pos;
in float val;
out vec4 radii;
flat out float finalVal;
void main() {
gl_Position = ModelViewMatrix * vec4(pos, 1.0);
float psize = (ProjectionMatrix[3][3] == 0.0) ? (size / (-gl_Position.z * pixel_size)) : (size / pixel_size);
gl_PointSize = psize;
// calculate concentric radii in pixels
float radius = 0.5 * psize;
// start at the outside and progress toward the center
radii[0] = radius;
radii[1] = radius - 1.0;
radii[2] = radius - 1.0;
radii[3] = radius - 2.0;
// convert to PointCoord units
radii /= psize;
gl_Position = ProjectionMatrix * gl_Position;
finalVal = val;
}
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