Clément Foucault
b5bc2158a0
Instead of doing manual ray-plane intersection we use normalized positions of the grid mesh and apply scaling after interpolation so that we keep good precision even at really far distances. Precision is now two order of magnitude better and does not produce the same kind of artifact at lower clip start values. This commit also cleanup the implementation. Fixes T58918 Grid not appearing correctly at low clip start in 2.8
60 lines
1.3 KiB
GLSL
60 lines
1.3 KiB
GLSL
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/* Infinite grid
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* Clément Foucault */
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uniform mat4 ViewProjectionMatrix;
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uniform mat4 ProjectionMatrix;
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uniform vec3 cameraPos;
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uniform vec3 planeAxes;
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uniform vec4 gridSettings;
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uniform float meshSize;
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#define gridDistance gridSettings.x
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#define gridResolution gridSettings.y
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#define gridScale gridSettings.z
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#define gridSubdiv gridSettings.w
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uniform int gridFlag;
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#define PLANE_XY (1 << 4)
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#define PLANE_XZ (1 << 5)
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#define PLANE_YZ (1 << 6)
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#define CLIP_Z_POS (1 << 7)
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#define CLIP_Z_NEG (1 << 8)
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in vec3 pos;
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out vec3 local_pos;
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void main()
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{
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vec3 vert_pos;
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/* Project camera pos to the needed plane */
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if ((gridFlag & PLANE_XY) != 0) {
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vert_pos = vec3(pos.x, pos.y, 0.0);
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}
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else if ((gridFlag & PLANE_XZ) != 0) {
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vert_pos = vec3(pos.x, 0.0, pos.y);
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}
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else {
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vert_pos = vec3(0.0, pos.x, pos.y);
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}
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local_pos = vert_pos;
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vec3 real_pos = cameraPos * planeAxes + vert_pos * meshSize;
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/* Used for additional Z axis */
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if ((gridFlag & CLIP_Z_POS) != 0) {
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real_pos.z = clamp(real_pos.z, 0.0, 1e30);
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local_pos.z = clamp(local_pos.z, 0.0, 1.0);
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}
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if ((gridFlag & CLIP_Z_NEG) != 0) {
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real_pos.z = clamp(real_pos.z, -1e30, 0.0);
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local_pos.z = clamp(local_pos.z, -1.0, 0.0);
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}
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gl_Position = ViewProjectionMatrix * vec4(real_pos, 1.0);
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}
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