33 lines
1.2 KiB
GLSL
33 lines
1.2 KiB
GLSL
//SPDX-License-Identifier: MIT
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//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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#version 460
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#extension GL_EXT_ray_tracing : enable
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// RTVolume any-hit shader — runs on every candidate sphere hit because
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// the geometry is built non-opaque (BuildProcedural opaque=false) and
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// the instances don't force-opaque. Punches a spherical checkerboard of
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// holes: for half the cells it calls ignoreIntersectionEXT, so the ray
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// passes straight through and the background / spheres behind show
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// through — the visible proof the any-hit path runs. Mirrors
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// anyhit.wgsl on the WebGPU path.
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hitAttributeEXT vec2 attribs;
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layout(location = 0) rayPayloadInEXT vec3 hitValue;
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void main() {
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// Object-space hit point on the unit sphere → its normal/direction.
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vec3 posObj = gl_ObjectRayOriginEXT + gl_ObjectRayDirectionEXT * gl_HitTEXT;
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vec3 n = normalize(posObj);
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const float PI = 3.14159265;
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float longitude = atan(n.z, n.x); // [-PI, PI]
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float latitude = asin(clamp(n.y, -1.0, 1.0)); // [-PI/2, PI/2]
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int cu = int(floor((longitude + PI) / PI * 6.0));
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int cv = int(floor((latitude + PI * 0.5) / PI * 6.0));
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if (((cu + cv) & 1) == 0) {
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ignoreIntersectionEXT; // cut-out cell — see through
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}
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}
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