Composite - Arnold User Guide
The composite shader mixes two RGBA inputs according to a blend mode.
Operation
The following blend modes are available:
| A Passthrough A  |
B Passthrough B  |
Atop A * B.a + B * (1 - A.a)  |
Average (A + B) / 2  |
| Cojoint Over A + B * (1 - A.a) /B.a, A if A.a > B.a  |
Difference abs(A - B)  |
Disjoint Over A + B * (1 - A.a) / B.a, A + B if A.a + B.a < 1  |
Divide A / B, 0 if B == 0  |
| Exclusion A + B - 2 * A * B  |
From B - A  |
Geometric 2 * A * B / (A + B)  |
Hard Light Screen, A * B if A < 0.5  |
| Hypot Diagonal sqr(A * A + B * B)  |
In A * B.a  |
Mask B * A.a  |
Matte A * A.a + B * (1 - A.a)  |
| Max max(A, B)  |
Min min(A, B)  |
Minus A - B  |
Multiply A * B  |
| Out A * (1 - B.a)  |
Over A + B * (1 - A.a)  |
Overlay Screen, A * B if B < 0.5  |
Plus A + B  |
| Screen A + B - A * B if A and B in 0..1, else max(A, B)  |
Soft Light Softer version of Hard Light  |
Stencil B * (1 - A.a)  |
Under A * (1 - B.a) + B  |
| Xor A * (1 - B.a) + B * (1 - A.a)  |
Alpha Operation
The alpha channel operation can be:
- Same: Apply the same operation to Alpha as on RGB.
- A: Use the alpha from A.
- B: Use the alpha from B.