mib_color

Category: mental ray > Texture

Shader Family: Texture

Output: Color

This shader accepts a base color and up to 8 inputs (the exact number is determined by the num parameter), each of which consists of an input color, a weight scalar, and a mode. The inputs are evaluated in sequence, each operating on the result of the previous one (the first begins with the base color, which defaults to transparent black).

The following modes are supported:

Mode	Operation	Calculation
0	Blend	R = A . (1 - Ba) . w + B . w
1	Mix	R = A . (1 - w) + B . w
2	Add	R = A + B . w
3	Bounded Add	R = bound (A + B . w, 0, 1)
4	Multiply	R = A . B . w
5	Bounded Multiply	R = bound (A . B . w, 0, 1)
6	Replace Alpha	R_rgb = A_rgb; R_a = B_a

Where:

R is the next result

A is the previous result

B is the current color

w is the current weight

Subscripts _{r, g, b,} and _a are the red, green, blue, and alpha components.

Note that mode 6 does not ensure that the resulting alpha value is valid; that is, not less than red, green, or blue. mental ray corrects the alpha when storing the color in the frame buffer unless premultiplication is turned off.

Name	The name of the shader node displayed in the render tree. Enter any name you like, or leave the default.
num	The number of valid inputs. The minimum is 1 and the maximum is 8.
mode_*	The compositing modes as described in the table above.
weight_*	The compositing weights w as described in the table above.
color_*	The composited colors B as described in the table above.
color_base	The base color.

Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License

mib_color_mix