clara/bluenoise-raytracer
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Renaming to instanceCustomId

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This commit is contained in:
mklefrancois 2020-11-30 18:05:13 +01:00
parent 60b9191069
commit b1d17dbd2a
35 changed files with 167 additions and 157 deletions
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2
ray_tracing_manyhits/README.md
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@ -286,7 +286,7 @@ The stride device address will be modified like this:
## Extending Hit
The SBT can be larger than the number of shading models, which could then be used to have one shader per instance with its own data. For some applications, instead of retrieving the material information as in the main tutorial using a storage buffer and indexing into it using the `gl_InstanceID`, it is possible to set all of the material information in the SBT.
The SBT can be larger than the number of shading models, which could then be used to have one shader per instance with its own data. For some applications, instead of retrieving the material information as in the main tutorial using a storage buffer and indexing into it using the `gl_InstanceCustomIndexEXT`, it is possible to set all of the material information in the SBT.
The following modification will add another entry to the SBT with a different color per instance. The new SBT hit group (2) will use the same CHIT handle (4) as hit group 1.

10
ray_tracing_manyhits/hello_vulkan.cpp
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@ -692,11 +692,11 @@ void HelloVulkan::createTopLevelAS()
for(int i = 0; i < static_cast<int>(m_objInstance.size()); i++)
{
nvvk::RaytracingBuilderKHR::Instance rayInst;
rayInst.transform = m_objInstance[i].transform; // Position of the instance
rayInst.instanceId = i; // gl_InstanceID
rayInst.blasId = m_objInstance[i].objIndex;
rayInst.flags = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR;
rayInst.hitGroupId = m_objInstance[i].hitgroup; // Using the hit group set in main
rayInst.transform = m_objInstance[i].transform; // Position of the instance
rayInst.instanceCustomId = i; // gl_InstanceCustomIndexEXT
rayInst.blasId = m_objInstance[i].objIndex;
rayInst.flags = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR;
rayInst.hitGroupId = m_objInstance[i].hitgroup; // Using the hit group set in main
tlas.emplace_back(rayInst);
}
m_rtBuilder.buildTlas(tlas, vk::BuildAccelerationStructureFlagBitsKHR::ePreferFastTrace);

8
ray_tracing_manyhits/shaders/raytrace.rchit
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@ -37,7 +37,7 @@ pushC;
void main()
{
// Object of this instance
uint objId = scnDesc.i[gl_InstanceID].objId;
uint objId = scnDesc.i[gl_InstanceCustomIndexEXT].objId;
// Indices of the triangle
ivec3 ind = ivec3(indices[nonuniformEXT(objId)].i[3 * gl_PrimitiveID + 0], //
@ -53,13 +53,13 @@ void main()
// Computing the normal at hit position
vec3 normal = v0.nrm * barycentrics.x + v1.nrm * barycentrics.y + v2.nrm * barycentrics.z;
// Transforming the normal to world space
normal = normalize(vec3(scnDesc.i[gl_InstanceID].transfoIT * vec4(normal, 0.0)));
normal = normalize(vec3(scnDesc.i[gl_InstanceCustomIndexEXT].transfoIT * vec4(normal, 0.0)));
// Computing the coordinates of the hit position
vec3 worldPos = v0.pos * barycentrics.x + v1.pos * barycentrics.y + v2.pos * barycentrics.z;
// Transforming the position to world space
worldPos = vec3(scnDesc.i[gl_InstanceID].transfo * vec4(worldPos, 1.0));
worldPos = vec3(scnDesc.i[gl_InstanceCustomIndexEXT].transfo * vec4(worldPos, 1.0));
// Vector toward the light
vec3 L;
@ -87,7 +87,7 @@ void main()
vec3 diffuse = computeDiffuse(mat, L, normal);
if(mat.textureId >= 0)
{
uint txtId = mat.textureId + scnDesc.i[gl_InstanceID].txtOffset;
uint txtId = mat.textureId + scnDesc.i[gl_InstanceCustomIndexEXT].txtOffset;
vec2 texCoord =
v0.texCoord * barycentrics.x + v1.texCoord * barycentrics.y + v2.texCoord * barycentrics.z;
diffuse *= texture(textureSamplers[nonuniformEXT(txtId)], texCoord).xyz;