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cuda-based-raytrace
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Added alpha accum gui param

This commit is contained in:
Martin Opat 2025-01-15 19:53:50 +01:00
parent fca8ea3e84
commit f11eff0e96
5 changed files with 9 additions and 2 deletions
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1
src/consts.cu
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@ -51,6 +51,7 @@ void copyConstantsToDevice() {
__device__ float d_opacityK; __device__ float d_opacityK;
__device__ float d_sigmoidShift; __device__ float d_sigmoidShift;
__device__ float d_sigmoidExp; __device__ float d_sigmoidExp;
__device__ float d_alphaAcumLimit;
__device__ int d_tfComboSelected; __device__ int d_tfComboSelected;
__device__ int d_tfComboSelectedColor; __device__ int d_tfComboSelectedColor;
__device__ float d_opacityConst; __device__ float d_opacityConst;

4
src/consts.h
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@ -32,7 +32,7 @@ const float MAX_SPEED = 14.0f;
// --------------------------- Raycasting Constants --------------------------- // --------------------------- Raycasting Constants ---------------------------
const int SAMPLES_PER_PIXEL = 4; const int SAMPLES_PER_PIXEL = 4;
const float alphaAcumLimit = 0.4f; // TODO: Atm, this only works with sigmoid // const float alphaAcumLimit = 0.4f; // TODO: Atm, this only works with sigmoid
const float minAllowedDensity = 0.001f; const float minAllowedDensity = 0.001f;
const float stepSize = 0.02f; const float stepSize = 0.02f;
@ -67,6 +67,8 @@ extern __device__ float d_opacityK;
// sigmoid function variables // sigmoid function variables
extern __device__ float d_sigmoidShift; extern __device__ float d_sigmoidShift;
extern __device__ float d_sigmoidExp; extern __device__ float d_sigmoidExp;
// alpha accumulation limit
extern __device__ float d_alphaAcumLimit;
// combo box index // combo box index
extern __device__ int d_tfComboSelected; extern __device__ int d_tfComboSelected;
extern __device__ int d_tfComboSelectedColor; extern __device__ int d_tfComboSelectedColor;

3
src/gui/input/Widget.cpp
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@ -29,6 +29,7 @@ Widget::Widget(GLFWwindow* window) {
this->opacityK = 0; this->opacityK = 0;
this->sigmoidShift = 0.5f; this->sigmoidShift = 0.5f;
this->sigmoidExp = -250.0f; this->sigmoidExp = -250.0f;
this->alphaAcumLimit = 0.4f;
this->tfComboSelected = 0; this->tfComboSelected = 0;
this->opacityConst = 100; this->opacityConst = 100;
}; };
@ -53,6 +54,7 @@ void Widget::tick(double fps) {
ImGui::DragInt("Gradient exp. (log [1e-10, 1])", &this->opacityK, 1, 0, 100, "%d%%", ImGuiSliderFlags_AlwaysClamp); ImGui::DragInt("Gradient exp. (log [1e-10, 1])", &this->opacityK, 1, 0, 100, "%d%%", ImGuiSliderFlags_AlwaysClamp);
ImGui::DragFloat("sigmoidShift", &this->sigmoidShift, 0.01f, 0.0f, 1.0f, "%.2f"); ImGui::DragFloat("sigmoidShift", &this->sigmoidShift, 0.01f, 0.0f, 1.0f, "%.2f");
ImGui::InputFloat("sigmoidExp", &this->sigmoidExp, 10.0f, 100.0f, "%.0f"); ImGui::InputFloat("sigmoidExp", &this->sigmoidExp, 10.0f, 100.0f, "%.0f");
ImGui::DragFloat("Alpha accumulation limit", &this->alphaAcumLimit, 0.01f, 0.0f, 1.0f, "%.2f");
ImGui::DragInt("Opacity constant (log [1e-5, 1])", &this->opacityConst, 1, 0, 100, "%d%%", ImGuiSliderFlags_AlwaysClamp); ImGui::DragInt("Opacity constant (log [1e-5, 1])", &this->opacityConst, 1, 0, 100, "%d%%", ImGuiSliderFlags_AlwaysClamp);
// the items[] contains the entries for the combobox. The selected index is stored as an int on this->tfComboSelected // the items[] contains the entries for the combobox. The selected index is stored as an int on this->tfComboSelected
@ -130,6 +132,7 @@ void Widget::copyToDevice() {
cudaMemcpyToSymbol(&d_sigmoidShift, &this->sigmoidShift, sizeof(float)); cudaMemcpyToSymbol(&d_sigmoidShift, &this->sigmoidShift, sizeof(float));
cudaMemcpyToSymbol(&d_sigmoidExp, &this->sigmoidExp, sizeof(float)); cudaMemcpyToSymbol(&d_sigmoidExp, &this->sigmoidExp, sizeof(float));
cudaMemcpyToSymbol(&d_alphaAcumLimit, &this->alphaAcumLimit, sizeof(float));
cudaMemcpyToSymbol(&d_tfComboSelected, &this->tfComboSelected, sizeof(int)); cudaMemcpyToSymbol(&d_tfComboSelected, &this->tfComboSelected, sizeof(int));
this->opacityConstReal = std::pow(10.0f, (-5 + 0.05 * this->opacityConst)); this->opacityConstReal = std::pow(10.0f, (-5 + 0.05 * this->opacityConst));

1
src/gui/input/Widget.h
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@ -24,6 +24,7 @@ public:
float opacityKReal; float opacityKReal;
float sigmoidShift; float sigmoidShift;
float sigmoidExp; float sigmoidExp;
float alphaAcumLimit;
int opacityConst; int opacityConst;
float opacityConstReal; float opacityConstReal;

2
src/illumination/Raycaster.cu
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@ -84,7 +84,7 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer, const
float alphaAccum = 0.0f; float alphaAccum = 0.0f;
float t = tNear; // Front to back float t = tNear; // Front to back
while (t < tFar && alphaAccum < alphaAcumLimit) { while (t < tFar && alphaAccum < d_alphaAcumLimit) {
Point3 pos = d_cameraPos + rayDir * t; Point3 pos = d_cameraPos + rayDir * t;
// Convert to volume indices // Convert to volume indices