Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
> I never actually used bump_maps before. Now I try to use one, but not
> seeing any effect. Can someone assist me?
>
> The scene contains a stratosphere helium balloon, and the bump_map
> should have created the typical balloon surface. However, I don't see
> the surface changed. Before posting any images, I show you the scene
> file. is there any error the way I do it?

That light source is extremely bright, is that really needed?

radiosity=off but you can add:

 normal on // affect surface normal too

into the radiosity statement for when you set it to on.

The extreme bump_size might not be needed, unless your map image lacks contrast.
I made a test map of a dozen vertical lines, repeatedly changing smoothly from
almost black to nearly white, and it shows the "bumps" easily by using only
bump_size 1.5. Just thought I would mention that.

And of course, if you're expecting light to shadow transition bumps... well,
forget it, because a texture normal isn't going to change the surface itself.
;)
Only fakes the bumpiness for the lit area. And you might already know that, I'm
just telling what I can.

For the outside image_map you might want to add:

transmit all [decimal0to1]

so the inside texture is at least partially seen through it.
I'm not sure what you're actually trying for with those outside and inside
textures, but you could also apply it using interior_texture within the object.

Oh, the 'crand' might be a bad idea for that balloon.
Hopefully some help for now.

Bob

Post a reply to this message