// TODO: implement split texture rendering for Diffuse, Alpha & Specular (now supported only Combined)
// TODO: implement viriable view position (now supported only along Z axis)
public override void Render(MatCapSnapshot matCapSnapshot, LightingRig lightingRig, CameraRuntimeRef cameraRef)
{
Texture2D combined = matCapSnapshot.Combined;
Color[] pixels = combined.GetPixels();
// Min distance to sphere caluclated according to texel size
float epsilon = GetEpsilon(combined.width, combined.height);
// Pixels layed out left to right, bottom to top
for (int row = combined.height - 1; row >= 0; row--)
{
for (int col = 0; col < combined.width; col++)
{
var rayData = new RayData();
rayData.RayDirection = GetRayDirection(combined.width, col, combined.height, row, cameraRef);
rayData.LightingRig = lightingRig;
rayData.EyePosition = new Vector3(0, 0, -_distanceToSphere);
rayData.Epsilon = epsilon;
// TODO: use new Unity data oriented desing with ECS and Burst
// This task could be parallelized
int index = row * combined.width + col;
pixels[index] = RenderRay(rayData);
}
}
combined.SetPixels(pixels);
combined.Apply();
}
//#TODO: implement Spotlight and Area light support
private Color GetDiffuseColor(Vector3 normal, LightingRig lightingRig, Vector3 hitPoint)
{
Color color = Color.black;
// We can use "foreach" because Array doesn't create garbage
foreach (Light light in lightingRig.Lights)
{
Vector3 direction;
float intensity;
switch (light.type)
{
case LightType.Directional:
intensity = light.intensity;
// inverse because we need direction from sampling point to light
direction = -light.transform.forward;
break;
case LightType.Point:
var transform = light.transform;
Vector3 distance = transform.localPosition - hitPoint;
intensity = light.intensity * Mathf.Sqrt(distance.magnitude);
direction = distance.normalized;
break;
default:
continue;
}
// Lambert lighting
color += light.color * intensity * Math.Max(0, Vector3.Dot(normal, direction));
}
return(color);
}
public abstract void Render(MatCapSnapshot matCapSnapshot, LightingRig lightingRig, CameraRuntimeRef cameraRef);
public override void Render(MatCapSnapshot matCapSnapshot, LightingRig lightingRig, CameraRuntimeRef cameraRef)
{
// #TODO Implement compute shader version
}