Gloss/roughness control

[HermanCarlsson]

How can you create realistic materials without being able to control gloss/roughness with a texture/map? I can understand the need to keep it simple but without this basic feature you simply can't.

[Esben Oxholm]

Hi Herman.
Is it possible for you to elaborate what you mean?

It sounds like you are asking for the roughness slider which is present in, if not all, most material types.

Best regards

[HermanCarlsson]

The roughness slider is good when the material have the same gloss/roughness all over but that is rarely the case with real materials.

[Esben Oxholm]

The roughness slider is good when the material have the same gloss/roughness all over but that is rarely the case with real materials.

oh, true. I misread your first post. Sorry.
Can you show some examples where a roughness map would be useful. Not that I doubt you at all, I just can't see where I would use it in the type of work I am creating.

[HermanCarlsson]

Here are some examples where a gloss/roughness map/texture is needed. Unless your material is 100% clean and/or 100% homogeneous a gloss/roughness map would help.

[Esben Oxholm]

Thanks for the examples.

You have the possibility to use a specular map and a bump map. 
What will the gloss/roughness map give, that you can't achieve using the spec+bump maps?

[HermanCarlsson]

In all of the examples above the gloss/roughness value varies. Here is a more obvious example:

[Esben Oxholm]

Thank you for your patience Herman.

After experimenting a bit with the specular map, I realized that it controls the amount of reflection, while a roughness map would control how much the light gets scattered.

I should have realized this long ago 

[HermanCarlsson]

Np 

[Despot]

There is no way of driving roughness with an image map or procedural in KeyShot 5... this is something I have wanted for a long time, hopefully it will be added in future versions.

[KeyShot]

It is coming in KeyShot 6.

[HermanCarlsson]

Great : )