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Tutorial 6.
Lighting Your Scene and Using Materials. For mental ray renderer.
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separate materials.
own slots just to be on the safe side.
Also as mentioned before I have Named the
material with something easy to remember, I
usually name the material after the object it will
be applied to...ie Tweeter.
You will notice here that I have also entered
'Outer' and 'Dome' into the spaces next to the 2
materials. This is NOT the material name but an
ID name. The box to the left of the names is the
ID number and is used to identify which poly's
of the object receive this sub-material. The name
makes it easier for us to keep track on what the
ID's relate to in terms of parts of the object.

is purely because the default Mat ID for all poly's is 1.
So, eventually, with all that done can we finally get on and create these materials? Well I think so yes.
Lets choose another empty material slot in which to create our first sub-material, and change the type
of that material to a 'RayTrace' material. Why 'RayTrace', well it's probably best to consult the mr
manual for that one as it will be explained far better than I could do here.
Right, onwards.........empty slot and change to 'RayTrace'.......here we go...........................................