Unable to create Bump / Displacement effects __ got it!!

[vikram]

I'm unable to create Bump/Displacement in Skp Vray rendering. Can you please explain me how to do that.

I followed the manual i have and can see the bump effect in the V-ray Material Editor in the Preview, but in the final render, the surface looks smooths without any bump.

Steps I followed

1. Create a surface in Sketchup
2. Applied texture A on the surface
3. Opened V-Ray material editor, right click -> Add material -> Add VrayLinkedMtl and from Choose.. Dialogue box, selected 'texture A' -> Apply
4. Pulled down 'Maps' and checked 'Bump', clicked on 'm', selected 'Bitmap' from Type dropdown, clicked on 'm', selected the greyscale image of texture A, clicked 'Apply'.
5. on 'Update Preview', i can clearly see the Bump effect in the Material Preview. However, when i render the image, I cannot see any bump effect.

Tried the same with Displacement, that does not work either. Plz help.

Thanks,
Vikram.

[vikram]

Re: Unable to create Bump / Displacement effects

I downloaded a texture that has Bump and Displacement and tried it. It works well. I understood that i'm doing something worng, but unable to figure it out.

[dcauldwell_cg]

Re: Unable to create Bump / Displacement effects

Two things. One is that bump tends to be subtle, and isn't always obvious unless you see the transition of the material from shade to sunlight and the scale allows you to see it. You can always wang up the multiplier to increase it. It won't be so obvious if there is only global illumination (ie no sunlight).
Displacement, as you may have read, is flaky. But the principle is that you need to select the face and the edges of the face, group them, and then displacement should work - in most situations (!).

Good Luck

David

[vikram]

Re: Unable to create Bump / Displacement effects __ got it!!

Thanks to the forum. By refering to some of the older posts, I was able to create bump and displacement. Problem is, it take a while to get the texture to the size that you want and i'm not able to exactly position it the way i can, in the case of a Sketchup texture.