Press n or j to go to the next uncovered block, b, p or k for the previous block.
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export default "// See IntersectionUtils.glsl for the definitions of Ray, Intersections, INF_HIT,\n\
// NO_HIT, setShapeIntersection\n\
\n\
/* Clipping plane defines (set in Scene/VoxelRenderResources.js)\n\
#define CLIPPING_PLANES_UNION\n\
#define CLIPPING_PLANES_COUNT\n\
#define CLIPPING_PLANES_INTERSECTION_INDEX\n\
*/\n\
\n\
uniform sampler2D u_clippingPlanesTexture;\n\
uniform mat4 u_clippingPlanesMatrix;\n\
\n\
// Plane is in Hessian Normal Form\n\
vec4 intersectPlane(in Ray ray, in vec4 plane) {\n\
vec3 n = plane.xyz; // normal\n\
float w = plane.w; // -dot(pointOnPlane, normal)\n\
\n\
float a = dot(ray.pos, n);\n\
float b = dot(ray.dir, n);\n\
float t = -(w + a) / b;\n\
\n\
return vec4(n, t);\n\
}\n\
\n\
#ifdef CLIPPING_PLANES\n\
void intersectClippingPlanes(in Ray ray, inout Intersections ix) {\n\
vec4 backSide = vec4(-ray.dir, -INF_HIT);\n\
vec4 farSide = vec4(ray.dir, +INF_HIT);\n\
RayShapeIntersection clippingVolume;\n\
\n\
#if (CLIPPING_PLANES_COUNT == 1)\n\
// Union and intersection are the same when there's one clipping plane, and the code\n\
// is more simplified.\n\
vec4 planeUv = getClippingPlane(u_clippingPlanesTexture, 0);\n\
vec4 intersection = intersectPlane(ray, planeUv);\n\
bool reflects = dot(ray.dir, intersection.xyz) < 0.0;\n\
clippingVolume.entry = reflects ? backSide : intersection;\n\
clippingVolume.exit = reflects ? intersection : farSide;\n\
setShapeIntersection(ix, CLIPPING_PLANES_INTERSECTION_INDEX, clippingVolume);\n\
#elif defined(CLIPPING_PLANES_UNION)\n\
vec4 firstTransmission = vec4(ray.dir, +INF_HIT);\n\
vec4 lastReflection = vec4(-ray.dir, -INF_HIT);\n\
for (int i = 0; i < CLIPPING_PLANES_COUNT; i++) {\n\
vec4 planeUv = getClippingPlane(u_clippingPlanesTexture, i);\n\
vec4 intersection = intersectPlane(ray, planeUv);\n\
if (dot(ray.dir, planeUv.xyz) > 0.0) {\n\
firstTransmission = intersection.w <= firstTransmission.w ? intersection : firstTransmission;\n\
} else {\n\
lastReflection = intersection.w >= lastReflection.w ? intersection : lastReflection;\n\
}\n\
}\n\
clippingVolume.entry = backSide;\n\
clippingVolume.exit = lastReflection;\n\
setShapeIntersection(ix, CLIPPING_PLANES_INTERSECTION_INDEX + 0, clippingVolume);\n\
clippingVolume.entry = firstTransmission;\n\
clippingVolume.exit = farSide;\n\
setShapeIntersection(ix, CLIPPING_PLANES_INTERSECTION_INDEX + 1, clippingVolume);\n\
#else // intersection\n\
vec4 lastTransmission = vec4(ray.dir, -INF_HIT);\n\
vec4 firstReflection = vec4(-ray.dir, +INF_HIT);\n\
for (int i = 0; i < CLIPPING_PLANES_COUNT; i++) {\n\
vec4 planeUv = getClippingPlane(u_clippingPlanesTexture, i);\n\
vec4 intersection = intersectPlane(ray, planeUv);\n\
if (dot(ray.dir, planeUv.xyz) > 0.0) {\n\
lastTransmission = intersection.w > lastTransmission.w ? intersection : lastTransmission;\n\
} else {\n\
firstReflection = intersection.w < firstReflection.w ? intersection: firstReflection;\n\
}\n\
}\n\
if (lastTransmission.w < firstReflection.w) {\n\
clippingVolume.entry = lastTransmission;\n\
clippingVolume.exit = firstReflection;\n\
} else {\n\
clippingVolume.entry = vec4(-ray.dir, NO_HIT);\n\
clippingVolume.exit = vec4(ray.dir, NO_HIT);\n\
}\n\
setShapeIntersection(ix, CLIPPING_PLANES_INTERSECTION_INDEX, clippingVolume);\n\
#endif\n\
}\n\
#endif\n\
";
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