Implicit Object Reference in MEL Shading Expression

[isoparmB]

Instead of using expressions:

Depending on what type of attribute you want to control on your shader network (wether it has a single input like Diffuse, double inputs like the UV coordinates in a place2dTexture, or three inputs like that of the transparency channel), you can use either a single, double or triple shading switch, and connect the attribute of each surface to it's respective input array placement in the switch.

You first assign your shader to all your objects. Then, map an appropriate shading switch node to the attribute you want to control. Let's say for example you want to control color, you'd use a triple shading switch (because color in maya consists of R, G, and B channels, or H, S, V depending on your settings). You then open the attribute editor of the switch, click on the map button so that it updates the surfaces currently assigned to the shader (This also updates the number of input array slots found in the switch). You can then either manually connect the objects to the shading switch using the object's attribute (in this case three attributes, or one attribute connected to the three inputs of each object in the shading switch), or use a for in loop to cycle through a list of objects to connect to the apporpriate shading switch input attribute (make sure this list is in the same order as found in the shading switch, though).

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