Day11: Tutorials Part 05 (RBD)

Today's tutorial is on RBD.
The project will simulate car crash.

• Using low res proxy model to simulate collision
• Switching animation from key frames to RBD
• Modifying RBD data so that we could art direct the sim. More friction, less mass, replace angular velocty etc.
• Using colors and paint, specify which location gets affected. Eg. painting the hood of the car so that only the painted area gets displace/deformed.

Started experimenting with shader writing in Houdini.
Pretty complicated...

After countless of patterns and failures...
This is what I have that is least presentable...
First up, this shader is using a woven pattern to generate both the diffuse pattern and the displacement.
Here is have 2 colors with high contrast, just to visualized the differences.
The problems are displacement bound not set to a high enough range, the displacement amount is too much. Looking like scales instead.

With displacement bound set, fixes the displacement issue.

Tweaking of the displacement amount

Once I got the pattern that I'm going for, I changed the color to better match my reference image.
Now I see that there is specular high lights.

More tweaks

 

Trying to get a criss cross pattern...

No luck yet...