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cuda-based-raytrace
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Fixed rays not interacting with missing volume incorrectly when number of samples > 1

This commit is contained in:
Martin Opat 2025-01-11 14:59:27 +01:00
parent 3714389803
commit 1aa33e8e14
2 changed files with 4 additions and 3 deletions
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4
src/consts.h
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@ -26,9 +26,9 @@ const float MAX_SPEED = 14.0f;
// --------------------------- Raycasting Constants --------------------------- // --------------------------- Raycasting Constants ---------------------------
const int SAMPLES_PER_PIXEL = 1; const int SAMPLES_PER_PIXEL = 4;
const float alphaAcumLimit = 1.0f; // TODO: Atm, this does not work very intuitively, other parameters control transparency 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;

3
src/illumination/Raycaster.cu
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@ -21,7 +21,7 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
float accumR = 0.0f; float accumR = 0.0f;
float accumG = 0.0f; float accumG = 0.0f;
float accumB = 0.0f; float accumB = 0.0f;
float accumA = 1.0f; float accumA = 1.0f * (float)SAMPLES_PER_PIXEL;
// Initialize random state for ray scattering // Initialize random state for ray scattering
curandState randState; curandState randState;
@ -77,6 +77,7 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
accumG = d_backgroundColor.y * (float)SAMPLES_PER_PIXEL; accumG = d_backgroundColor.y * (float)SAMPLES_PER_PIXEL;
accumB = d_backgroundColor.z * (float)SAMPLES_PER_PIXEL; accumB = d_backgroundColor.z * (float)SAMPLES_PER_PIXEL;
accumA = 1.0f * (float)SAMPLES_PER_PIXEL; accumA = 1.0f * (float)SAMPLES_PER_PIXEL;
} else { } else {
if (tNear < 0.0f) tNear = 0.0f; if (tNear < 0.0f) tNear = 0.0f;