Setting Navmesh Materials in 3dsmax
For minor edits to a Navmesh, the materials will normally not need to be edited. But, for major editing, it is easier to import a navmesh with the needed materials, then use the 'get material' eyedropper on it. set the colors as shown to make it easier to understand which material is which. A setting of 50% transparency is useful so that overlaps etc. are easier to spot.
(The image above shows the material editor in 3ds Max v 7)A useful tip for major editing in 3dsMax, is to add two special materials to your max materials library, called Default and Default2, The Default2 material is identical except for the colour-shift; to use for preopt and manifold objects, in order to have these and the navmesh both visible at the same time and still tell which object is which. Every time you import a new navmesh, get these materials from the library and apply Default to both the Infantry/Vehicle meshes and go on from there.To set this in 3ds Max,Open the Material Editor, and select any empty material slot. Name this material 'Default' Change its type to Multi/Sub-Object. Change 'Set Number' to 3.
You should now see the three sub-materials we will use; one for each material type that navmeshes use - ground, water, and deep water.
Name these materials in that order so that their material IDs match the names:
1 is 'ground' - give this material a green colour.
2 is 'water' - make this material yellow.
3 is 'deepwater' - make this one blue.
One thing i find helpful is to make each of these materials 50% transparent - it has no effect whatsoever on the mesh itself, but makes it easier to make out when one piece of mesh is above another, like you may find with bridges, multi-story buildings etc.
Now clone the entire 'Default' material you just made, and call it 'Default2' Make the color of ID1 'ground' magenta.** Make the color of ID2 'water' purple. Make the color of ID3 'deep water' cyan.
This second material is for applying to the preopt object if you need to import it, or for adding to a cloned piece of navmesh where it is important to tell the clone from the original on-screen. The colors for Default2 were chosen because they sit well with the colors in the Default material - sometimes they will each be on overlapping objects, and you will want to be able to discern which object has which material.
Now add both Default and Default2 to your Max material library.
You can use any colors you like, but to avoid confusion in this tutorial it would be better to use those colors suggested.