Šviesos laužimas per pikselį
(Nukreipta iš Šviesos laužimas per pixelį)
- Panaudosime įstatyta HLSL funkciją refract.
- Vertex shader kodas yra toks:
float4 view_position;
float4x4 view_proj_matrix;
struct VS_OUTPUT
{
float4 Pos: POSITION;
float3 Normal: TEXCOORD0;
float3 View: TEXCOORD1;
};
VS_OUTPUT vs_main(float4 inPos: POSITION, float3 inNormal: NORMAL)
{
VS_OUTPUT Out;
// Compute the projected position and send out the normal
Out.Pos = mul(view_proj_matrix, inPos);
Out.Normal = normalize(inNormal);
// Determine the view direction (i.e: eye vector) for our
// refraction calculations
Out.View = normalize(view_position-inPos);
return Out;
}
- Pixel shader kodas yra toks:
float indexOfRefractionRatio;
sampler Environment;
float4 ps_main(float3 inNormal: TEXCOORD0, float3 inView: TEXCOORD1) : COLOR
{
// Make sure all incoming vectors are normalized
inNormal = normalize(inNormal);
inView = normalize(inView);
// Refraction texture lookup
float3 refrVect = refract(-inView,inNormal,indexOfRefractionRatio).xyz;
float4 refraction = texCUBE(Environment,refrVect);
// Output refracted color
return refraction;
}