Bumpmapping

Xsi
1

Hi all,

Been looking at this for a day or so now and still no idea.

Approaching bumpmapping 2 different ways here, why do they produce different results?

Method one;

Using Mix2colours with my bumpmap in Colour1 and weight 100% on base colour (with bump enabled on whatever I have plugged into Colour1)

Method two;

Plugging Bumpmapgenerator into Bump node of material (not shder) and plugging my bumpmap (with Bump enabled) into Bumpmap Generator.

Comparing these 2 methods, I see the bump on teh specular areas is exactly the same (switching between the 2 methods in rendertree) but non-specular areas are different.

Any explanation why these produce different results?

2

I have a render tree here which goes like this :
bump image clip connected to input of bump map generator node.
In bump map generator, enabled "bump" and "clamp".
Bump map generator connected to the bump of the phong node.
I don't think you should use the mix2colors node, unless your bump is the alpha of your texture.

3

ok. I've not seen any textures with an alpha that I can recall

So what's the diff between the shader bump node and the material bump node?