fine displacement

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  03 March 2003
fine displacement

the link above is a displacement video on making a tire. i downloaded mental ray from the site, but i'd like someone to explain for to do what the video says, especially the shader network. i looks real complex in the video.

Pls help me guys.
  03 March 2003
no one knows, or is my post just moved to the darkest cave in cg talk?
  03 March 2003
that video leaves some small steps out that you need to get to the fine displace result they talk about.

first of: the shader is the same no matter if you use maya or mental ray to do the rendering.
so check your manuals to see how you create a displacement in maya (which basically means dragging your texture on the displacement field in the shaders shading group (the SG thingy in front of the lambert or blinn).

to get the "fine" displacement you need to create a new tesselation node in the mental ray render globals (sorry.. cant look the name up right now..) and in there you can chose between a variety of different tesselation methods.
there you can chose one that will allow you to do the fine renderings (again sorry.. just tried that one and dont remember the exact names of it)..

just play around.. you will find the right settings


  03 March 2003
thanks for the tips, i tried the maya displacement tutorial b4 seeing this messgae, and i got it to work, but i just can't transform it to mental ray. i'll give it a shot now.

thanks alexx...very much
  03 March 2003
arrrgh! wont work. wont load the thread tiff i download from wavefront, and normal maya displacement mapping turns a car tire to a tank tire. hate this S****t :annoyed:
  03 March 2003
I think i found what your looking for

Don't ask me what the setting do ...the doc suck for this

In MR globals turn the quality setting to anything other than "deriveFromMaya" like preview

go to preview tab and under overrides->tesselation click th map button next to displace Approx

i think this will effect all objects in the scene

you can also pick an object and go to mental ray for Maya's Approximation Editor (Window > Rendering Editors > mental ray > Approximation Editor).
rehab is for quiters
  03 March 2003
are you still having problems...???cuz I don't want to type if you've figured it out...
  03 March 2003
i lost interest for a second, but i haven't figured it out, but i am about to try all tips given, and i am open for your info pls matty429.

thnx guys for still tryin to help. i really appreciate it.

I am very grateful, and i hope bambam's tip works. {//*opening maya*\\}
  03 March 2003
1. Make your Displacement in maya ...As usual.....Use a Alpha texture if possible... object you want to displace in viweport...

3.Go to >Window>rendering editors>Mental Ray>Approximation editor.

4.Click on create On the Displace approx row

5.Click assign

6. Render

7. In the maya displacement node....Adjust Alpha gain under color balance.. for height
  03 March 2003
thanks alot matty, ur tip worked fine... perfect. i am very grateful for your help. all i got to do now is play around with the settings so that the bums on my tire thread are smaller, and repeat in the same pattern over and over... as opposed to my image being displaced on the surface on one instance.
thanks again to eveyone that has helped me.
  03 March 2003
Now teach someone else..When they get stuck....
  03 March 2003
:-) most definately... do you understand what i mean by making the displacement map repeat it self ? like the thread marks of a tire?
  03 March 2003
never mind... think i got it.

i set repeat V of my displacement file to -10 , and this gave me my repetition, but it was blurry, and the displacement wasnt seperated. i then took the earlier advice by BamBam, and it came out perfect.

thanks a whole bunch!!!!:airguitar

Last edited by Xyllon : 03 March 2003 at 07:40 AM.
  01 January 2006
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