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Forgot to do atomic commits so ... booyah

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Martin Opat
2025-01-08 22:43:30 +01:00
parent 6f22230ead
commit d3b88aed30
4 changed files with 41 additions and 31 deletions
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46
src/illumination/Raycaster.cu
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@@ -40,28 +40,29 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
// Intersect (for simplicity just a 3D box from 0 to 1 in all dimensions) - TODO: Think about whether this is the best way to do this
float tNear = 0.0f;
float tFar = 1e6f;
auto intersectAxis = [&](float start, float dirVal) {
if (fabsf(dirVal) < epsilon) {
if (start < 0.f || start > 1.f) {
tNear = 1e9f;
auto intersectAxis = [&](float start, float dir, float minV, float maxV) {
if (fabsf(dir) < epsilon) {
// Ray parallel to axis. If outside min..max, no intersection.
if (start < minV || start > maxV) {
tNear = 1e9f;
tFar = -1e9f;
}
} else {
float t0 = (0.0f - start) / dirVal;
float t1 = (1.0f - start) / dirVal;
if (t0>t1) {
float tmp=t0;
t0=t1;
t1=tmp;
float t0 = (minV - start) / dir;
float t1 = (maxV - start) / dir;
if (t0 > t1) {
float tmp = t0;
t0 = t1;
t1 = tmp;
}
if (t0>tNear) tNear = t0;
if (t1<tFar ) tFar = t1;
if (t0 > tNear) tNear = t0;
if (t1 < tFar ) tFar = t1;
}
};
intersectAxis(d_cameraPos.x, rayDir.x);
intersectAxis(d_cameraPos.y, rayDir.y);
intersectAxis(d_cameraPos.z, rayDir.z);
intersectAxis(d_cameraPos.x, rayDir.x, 0.0f, (float)VOLUME_WIDTH);
intersectAxis(d_cameraPos.y, rayDir.y, 0.0f, (float)VOLUME_HEIGHT);
intersectAxis(d_cameraPos.z, rayDir.z, 0.0f, (float)VOLUME_DEPTH);
if (tNear > tFar) continue; // No intersectionn
if (tNear < 0.0f) tNear = 0.0f;
@@ -74,12 +75,12 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
Point3 pos = d_cameraPos + rayDir * tCurrent;
// Convert to volume indices
float fx = pos.x * (VOLUME_WIDTH - 1);
float fy = pos.y * (VOLUME_HEIGHT - 1);
float fz = pos.z * (VOLUME_DEPTH - 1);
int ix = (int)roundf(fx);
int iy = (int)roundf(fy);
int iz = (int)roundf(fz);
// float fx = pos.x * (VOLUME_WIDTH - 1);
// float fy = pos.y * (VOLUME_HEIGHT - 1);
// float fz = pos.z * (VOLUME_DEPTH - 1);
int ix = (int)roundf(pos.x);
int iy = (int)roundf(pos.y);
int iz = (int)roundf(pos.z);
// Sample
float density = sampleVolumeNearest(volumeData, VOLUME_WIDTH, VOLUME_HEIGHT, VOLUME_DEPTH, ix, iy, iz);
@@ -107,6 +108,9 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
alphaAccum += (1.0f - alphaAccum) * alphaSample;
}
// TODO: Add silhouette - Take gradient of volume dot with view direction (if small then this is a silhouette)
// TODO: Scale volume correctly
tCurrent += stepSize;
}