Jamie Greunbaum
8eaef49f2e
- Moved video screen into its own separate movie tent. - Adjusted stable post-processing volume. - Chickens are now at full volume. - Added button to toggle chickens off and on.
43 lines
1.4 KiB
HLSL
43 lines
1.4 KiB
HLSL
#ifndef SERVICE_PARALLAX_INCLUDED
|
|
#define SERVICE_PARALLAX_INCLUDED
|
|
|
|
// Please define a PerPixelHeightDisplacementParam parameter
|
|
// and ComputePerPixelHeightDisplacement function to sample the heightmap.
|
|
|
|
float2 ParallaxRaymarching(float2 viewDir, PerPixelHeightDisplacementParam ppdParam,
|
|
float strength, out float outHeight)
|
|
{
|
|
const float raymarch_steps = 10;
|
|
|
|
float2 uvOffset = 0;
|
|
const float stepSize = 1.0 / raymarch_steps;
|
|
float2 uvDelta = viewDir * (stepSize * strength);
|
|
|
|
float stepHeight = 1;
|
|
float surfaceHeight = ComputePerPixelHeightDisplacement(0, 0, ppdParam);
|
|
|
|
float2 prevUVOffset = uvOffset;
|
|
float prevStepHeight = stepHeight;
|
|
float prevSurfaceHeight = surfaceHeight;
|
|
|
|
for (int i = 1; i < raymarch_steps && stepHeight > surfaceHeight; i++)
|
|
{
|
|
prevUVOffset = uvOffset;
|
|
prevStepHeight = stepHeight;
|
|
prevSurfaceHeight = surfaceHeight;
|
|
|
|
uvOffset -= uvDelta;
|
|
stepHeight -= stepSize;
|
|
surfaceHeight = ComputePerPixelHeightDisplacement(uvOffset, 0, ppdParam);
|
|
}
|
|
|
|
float prevDifference = prevStepHeight - prevSurfaceHeight;
|
|
float difference = surfaceHeight - stepHeight;
|
|
float t = prevDifference / (prevDifference + difference);
|
|
uvOffset = prevUVOffset -uvDelta * t;
|
|
|
|
outHeight = surfaceHeight;
|
|
return uvOffset;
|
|
}
|
|
|
|
#endif // SERVICE_PARALLAX_INCLUDED |