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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| #ifndef BTDF_INCLUDED | ||
| #define BTDF_INCLUDED | ||
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| #include "Refraction.glsl" | ||
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| vec4 renderer_texelSize; // x: 1/width, y: 1/height, z: width, w: height | ||
| sampler2D camera_OpaqueTexture; | ||
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| #ifdef MATERIAL_ENABLE_SS_REFRACTION | ||
| vec3 evaluateRefraction(Varyings varyings, SurfaceData surfaceData, BRDFData brdfData, vec3 speculaColor) { | ||
| RefractionModel ray; | ||
| #if REFRACTION_SPHERE | ||
| RefractionModelSphere(surfaceData.viewDir, varyings.positionWS, varyings.normalWS, surfaceData.IOR, surfaceData.thickness, ray); | ||
| #elif REFRACTION_PLANE | ||
| RefractionModelBox(surfaceData.viewDir, varyings.positionWS, varyings.normalWS, surfaceData.IOR, surfaceData.thickness, ray); | ||
| #elif REFRACTION_THIN | ||
| RefractionModelBox(surfaceData.viewDir, varyings.positionWS, varyings.normalWS, surfaceData.IOR, surfaceData.thickness, ray); | ||
| #endif | ||
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| vec3 refractedRayExit = ray.position; //ray.position + ray.direction; | ||
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| // Project refracted vector on the framebuffer, while mapping to normalized device coordinates. | ||
| vec4 ndcPos = camera_ProjMat * camera_ViewMat * vec4( refractedRayExit, 1.0 ); | ||
| vec2 refractionCoords = ndcPos.xy / ndcPos.w; | ||
| refractionCoords *= 0.5; | ||
| refractionCoords += 0.5; | ||
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| // compute transmission | ||
| vec3 absorptionCoefficient = max(vec3(0), -log(surfaceData.attenuationColor)/surfaceData.attenuationDistance); | ||
| #ifdef MATERIAL_HAS_ABSORPTION | ||
| vec3 transmittance = min(vec3(1.0), exp(-absorptionCoefficient * ray.dist)); | ||
| #else | ||
| vec3 transmittance = 1.0 - absorptionCoefficient; | ||
| #endif | ||
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| // vec4 transmittedLight = texture2D(camera_OpaqueTexture, varyings.uv); | ||
| vec4 transmittedLight = sampleTexture2DBicubic(camera_OpaqueTexture, refractionCoords, renderer_texelSize); | ||
| // vec3 transmittanceColor = brdfData.diffuseColor * transmittance; | ||
| vec3 E = envBRDFApprox(speculaColor, brdfData.roughness, surfaceData.dotNV); | ||
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| vec3 ft = transmittedLight.rgb; | ||
| ft *= brdfData.diffuseColor; | ||
| ft *= 1.0 - E; | ||
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| #ifdef MATERIAL_HAS_ABSORPTION | ||
| ft *= transmittance; | ||
| #endif | ||
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| return ft; | ||
| } | ||
| #endif | ||
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| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| #ifndef REFRACTION_INCLUDED | ||
| #define REFRACTION_INCLUDED | ||
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| #ifdef MATERIAL_ENABLE_SS_REFRACTION | ||
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| struct RefractionModel{ | ||
| float dist; // length of the transmission during refraction through the shape | ||
| vec3 position; // out ray position | ||
| vec3 direction; // out ray direction | ||
| }; | ||
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| void RefractionModelSphere(vec3 V, vec3 positionWS, vec3 normalWS, float ior, float thickness, out RefractionModel ray){ | ||
| // Sphere shape model: | ||
| // We approximate locally the shape of the object as sphere, that is tangent to the shape. | ||
| // The sphere has a diameter of {thickness} | ||
| // The center of the sphere is at {positionWS} - {normalWS} * {thickness} * 0.5 | ||
| // So the light is refracted twice: in and out of the tangent sphere | ||
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| // First refraction (tangent sphere in) | ||
| // Refracted ray | ||
| vec3 R1 = refract(V, normalWS, 1.0 / ior); | ||
| // Center of the tangent sphere | ||
| vec3 C = positionWS - normalWS * thickness * 0.5; | ||
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| // Second refraction (tangent sphere out) | ||
| float NoR1 = dot(normalWS, R1); | ||
| // Optical depth within the sphere | ||
| float dist = -NoR1 * thickness; | ||
| // Out hit point in the tangent sphere | ||
| vec3 P1 = positionWS + R1 * dist; | ||
| // Out normal | ||
| vec3 N1 = normalize(C - P1); | ||
| // Out refracted ray | ||
| vec3 R2 = refract(R1, N1, ior); | ||
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| ray.dist = dist; | ||
| ray.position = P1; | ||
| ray.direction = R2; | ||
| } | ||
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| void RefractionModelBox(vec3 V, vec3 positionWS, vec3 normalWS, float ior, float thickness, out RefractionModel ray){ | ||
| // Plane shape model: | ||
| // We approximate locally the shape of the object as a plane with normal {normalWS} at {positionWS} | ||
| // with a thickness {thickness} | ||
| // Refracted ray | ||
| vec3 R = refract(V, normalWS, 1.0 / ior); | ||
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| // Optical depth within the thin plane | ||
| float dist = thickness / max(dot(R, -normalWS), 0.001); | ||
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| ray.dist = dist; | ||
| ray.position = positionWS + R * dist; | ||
| ray.direction = V; | ||
| } | ||
| #endif | ||
| #endif |
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