Post edited 2:13 am – Jun 29, 2009 by Shack Dougall
It really depends on what you mean by “adding colour”. I assume that you are talking about plain, solid colors.
If you want all the prims in the build to be the same color, then the cheapest way to do it is to export and upload the build without textures. Then, in Second Life, select all the prims, click the texture panel in the editor. Click the texture box. When the texture picker opens, press blank, and then select. Now, click the color box. When the color picker opens, select a color and press select. That will color your whole build a plain solid color.
If you want different prims to have different colors. Then, you probably want to use materials in 3ds Max. You will need a white texture such as white.tga. Create a Standard material for each color and set its diffuse map to white.tga. Then, in the material's Second Life – Texture Parameters rollout, change the color. For example, you could use this method to create red, blue, and green materials. Apply the materials to your prims. When you export, check textures, but not bake. Since all of the materials use the same texture (white.tga), only one texture will be exported, no matter how many colors you have defined. So, that let's you make each prim in a build a different color for a flat upload charge of L$10.
This method will not, however, allow you to put different colors on different parts of the same prim.