public static Ray CreatePrime(int x, int y, Scene scene, int sample, float4x2 jitterMatrix)
{
// Determine X and Y
var sensorX = (2f * (x + jitterMatrix[sample][0]) / scene.Width) - 1f;
var sensorY = 1f - (2f * (y + jitterMatrix[sample][1]) / scene.Height);
// Adjust for the aspect ratio
var aspectRatio = (float)scene.Width / (float)scene.Height;
sensorX *= aspectRatio;
// Adjust for the FOV
var fovAdjustment = Hlsl.Tan((scene.Camera.FOV * (MathF.PI / 180f)) / 2f);
sensorX *= fovAdjustment;
sensorY *= fovAdjustment;
#pragma warning disable IDE0017 // Simplify object initialization
var ray = new Ray();
ray.Origin = new Vector3();
ray.Direction = Hlsl.Normalize(new float3(sensorX, sensorY, -1.0f));
#pragma warning restore IDE0017 // Simplify object initialization
return(ray);
}
private static float3 PlaneSurfaceNormal(RenderableEntity entity, float3 hitPoint)
{
return(-Hlsl.Normalize(entity.Normal));
}
private static float3 SphereSurfaceNormal(RenderableEntity entity, float3 hitPoint)
{
return(Hlsl.Normalize(hitPoint - entity.Position));
}