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Fixed the coordinate system.

This commit is contained in:
Anish Bhobe 2024-07-29 23:58:30 +02:00
parent 6d39576b5c
commit f735b63d7e
1 changed files with 8 additions and 8 deletions
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16
samples/03_model_render/shader/eqrectToCube.cs.hlsl
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@ -12,11 +12,11 @@ Block pcb;
float2 SampleSphericalMap(float3 v)
{
const float2 invAtan = float2(0.1591f, 0.3183f);
float2 uv = float2(atan2(v.x, v.z), asin(v.y));
uv *= invAtan;
uv += 0.5;
return uv;
const float2 InvTan = float2(0.1591f, 0.3183f); // (1/2PI, 1/PI)
float2 UV = float2(atan2(-v.x, v.z), asin(-v.y)); // (-PI, -PI/2) to (PI, PI/2)
UV *= InvTan; // (-1/2, -1/2) to (1/2, 1/2)
UV += 0.5f.xx; // (0, 0) to (1, 1)
return UV;
}
/*
@ -39,15 +39,15 @@ void main(uint3 GlobalInvocationID : SV_DispatchThreadID)
if (GlobalInvocationID.z < 2)
{
LocalDir = float3(AxisSign * HalfSide, GlobalInvocationID.y - HalfSide, (GlobalInvocationID.x - HalfSide) * AxisSign);
LocalDir = float3(AxisSign * HalfSide, HalfSide - GlobalInvocationID.y, (HalfSide - GlobalInvocationID.x) * AxisSign);
}
else if (GlobalInvocationID.z < 4)
{
LocalDir = float3(GlobalInvocationID.x - HalfSide, -AxisSign * HalfSide, -AxisSign * (GlobalInvocationID.y - HalfSide));
LocalDir = float3(GlobalInvocationID.x - HalfSide, AxisSign * HalfSide, AxisSign * (GlobalInvocationID.y - HalfSide));
}
else
{
LocalDir = float3((GlobalInvocationID.x - HalfSide) * AxisSign, GlobalInvocationID.y - HalfSide, -AxisSign * HalfSide);
LocalDir = float3((GlobalInvocationID.x - HalfSide) * AxisSign, HalfSide - GlobalInvocationID.y, HalfSide * AxisSign);
}
float2 UV = SampleSphericalMap(normalize(LocalDir));