Texturing the Inside of Hollow Prims

Hi Everyone!

Just thought I'd mention that I have just put a new book out about Texturing the Insides of Hollow Prims, in the Texture Library in Livingtree, next to the Texture Tutorials.

In it, I explain (complete with pictures) all the formula needed to put textures on the insides of hollow prims of all shapes, with all kinds of hollows.

There's also a section about texturing hollow boxes using Planar Projection (just use the same projection values on the inside and outside; textures that you've made to fit on tapered prims will fit the same way on the inside of them.)

The book ends with the formula you need to fit a specially created texture to the inside of a hollow box, so that it appears that each side has a different texture. (1* the hollow amount, as a percentage.) including an explanation, in some detail, about how to make the right kind of texture, in case you need that information.

It's free to come and read all you want. (There is a small fee to take a book away with you.)

But it all goes into much more detail than anything I could do here. So, if you're interested, come and take a look!

You can get the location from my Picks, or come to the Texture Library, Livingtree (113, 97, 25)

See you there!

Robin, I noticed you don't know why a hollow triangle uses a 2.56 multiplier... I have a hypothesis. I noticed that if you multiplied 2.56 by 100, you get 256 which is 2 to the power of 8 and one of the standard size for SL textures.

I suppose using the 2.56 multiplier makes each 0.01 segment correspond to a single pixel in a 256x256 texture and simplifies texture mapping calculations for a hollow triangle.

Hummm. .. It could be. I hadn't thought of that.

I really don't know why. I just know that it seems to work.

Thanks Robin! I'll look for that next time I am in-world.

By the way, has anyone else noted that the planar texturing method is really screwed up for the outside of cylinders and the hollowed surface of a prim if the hollow is circular? Try using planar textures on the inside of a barrel vault, made with a box prim that's cut in half and has a circular hollow to form the arch. The curved survace is very distorted, if you use planar texturing. Same thing if you use planar to texture the outside of a cylinder. Very distorted results.