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cuda-based-raytrace
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Added background colour to consts.h

This commit is contained in:
Martin Opat 2025-01-11 13:05:18 +01:00
parent a5c66fc6ca
commit 9afd242121
3 changed files with 13 additions and 7 deletions
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3
src/consts.cu
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@ -30,6 +30,7 @@ __device__ Point3 d_cameraPos;
__device__ Vec3 d_cameraDir;
__device__ Vec3 d_cameraUp;
__device__ Point3 d_lightPos;
__device__ Color3 d_backgroundColor;
// Point3 h_cameraPos = Point3::init(300.0f, 200.0f, -700.0f); // Camera for full data set
Point3 h_cameraPos = Point3::init(50.0f, -50.0f, -75.0f); // Camera for partially trimmed data set (TODO: Probably upside down atm)
@ -37,6 +38,7 @@ Vec3 center = Vec3::init((float)VOLUME_WIDTH/2.0f, (float)VOLUME_HEIGHT/2.0f, (f
Vec3 h_cameraDir = (center - h_cameraPos).normalize();
Vec3 h_cameraUp = Vec3::init(0.0, 0.0, 1.0).normalize();
Point3 h_lightPos = Point3::init(1.5, 2.0, -1.0);
Color3 h_backgroundColor = Color3::init(0.1f, 0.1f, 0.1f);
// Copy the above values to the device
@ -52,4 +54,5 @@ void copyConstantsToDevice() {
cudaMemcpyToSymbol(d_cameraDir, &h_cameraDir, sizeof(Vec3));
cudaMemcpyToSymbol(d_cameraUp, &h_cameraUp, sizeof(Vec3));
cudaMemcpyToSymbol(d_lightPos, &h_lightPos, sizeof(Point3));
cudaMemcpyToSymbol(d_backgroundColor, &h_backgroundColor, sizeof(Color3));
}

3
src/consts.h
View File

@ -35,6 +35,7 @@ const float stepSize = 0.02f;
// --------------------------- Illumination Constants ---------------------------
// Shading consts
const double ambientStrength = 0.3;
const double diffuseStrength = 0.8;
const double specularStrength = 0.5;
@ -47,6 +48,8 @@ extern __device__ Vec3 d_cameraDir;
extern __device__ Vec3 d_cameraUp;
extern __device__ Point3 d_lightPos;
// Background color
extern __device__ Color3 d_backgroundColor;
// --------------------------- Transfer Function Constants ---------------------------
struct ColorStop {

14
src/illumination/Raycaster.cu
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@ -72,9 +72,9 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
if (tNear > tFar) {
// No intersection -> Set to brackground color (multiply by SAMPLES_PER_PIXEL because we divide by it later)
accumR = 0.1f * (float)SAMPLES_PER_PIXEL;
accumG = 0.1f * (float)SAMPLES_PER_PIXEL;
accumB = 0.1f * (float)SAMPLES_PER_PIXEL;
accumR = d_backgroundColor.x * (float)SAMPLES_PER_PIXEL;
accumG = d_backgroundColor.y * (float)SAMPLES_PER_PIXEL;
accumB = d_backgroundColor.z * (float)SAMPLES_PER_PIXEL;
accumA = 1.0f * (float)SAMPLES_PER_PIXEL;
} else {
if (tNear < 0.0f) tNear = 0.0f;
@ -119,11 +119,11 @@ __global__ void raycastKernel(float* volumeData, FrameBuffer framebuffer) {
accumB += colorB;
accumA += alphaAccum;
// Blend with background (for transparency) // TODO: Put background colour in a constant
// Blend with background (for transparency)
float leftover = 1.0 - alphaAccum;
accumR = accumR + leftover * 0.1f;
accumG = accumG + leftover * 0.1f;
accumB = accumB + leftover * 0.1f;
accumR = accumR + leftover * d_backgroundColor.x;
accumG = accumG + leftover * d_backgroundColor.y;
accumB = accumB + leftover * d_backgroundColor.z;
}
}