Geometry tag

[ruby_vandeursen]

Hi,

Is it possible to offset the geometry tag? When using displacement I want the material tag to correspond with the displacement. I can offset the material tag but the displacement tag doesn't move with it. How can I fix this?

[zhanet.georgieva]

Hi ruby_vandeursen,

By default, V-Ray Displacement uses the assigned material as a UV channel. That means, you can change the UV channel considered for displacement by changing the material in the Material tag field.
If you want to align the Displacement map to the UVW mapping of another material, you can use Xpresso to create custom expressions. This allows to connect properties from one material to another.

[ruby_vandeursen]

Hi Zhanet,

Thanks for your response. Here is what I do:

I have a wood texture with planks assigned as a material. I use cubic mapping to place the texture correctly, in my case lenght u 200% and lenght v 200% and a V offset of 3%. Then I go to Tags, generate UVW coordinates. The displacement map keeps appearing at 100% with no offset and doesn't correspond with the texture. In previous versions you could just copy the material and replace it with the displacement material and it always corresponded. It could be that my workflow isn't correct, do you have any suggestions?

[sirio76]

Hi,

Is it possible to offset the geometry tag? When using displacement I want the material tag to correspond with the displacement. I can offset the material tag but the displacement tag doesn't move with it. How can I fix this?

Just drag and drop the texture tag inside the displacement material slot, then it will match the projection.

[ruby_vandeursen]

Oow my, that simple! Thanks, that's it!

[ruby_vandeursen]

Okay, so now it works for the wood material. Now I'm strugling with the roof material. It appears okay without dropping the material in the material tag but when I do so I get something strange, it doens't tile correctly. Any suggestions?

[sirio76]

Okay, so now it works for the wood material. Now I'm strugling with the roof material. It appears okay without dropping the material in the material tag but when I do so I get something strange, it doens't tile correctly. Any suggestions?

are you sure you have correct UV?

[ruby_vandeursen]

I created a plane with subdivison 20x20. I assign the material and change the projection to cubic and than scale the material 200%. I removed the UVW tab that comes with the plane and generated a new one. Than I assign the geometry tag and drag the material in the material slot. Like I said, at 100% it works fine, this way it doesn't.

[sirio76]

Try to delete the UV tag, use flat projection (not cubic), scale the texture using the coordinates (not the UV tiling), then convert to UVW and use the geometry tag.
For large flat areas is better to use the 2D mode.

[ruby_vandeursen]

That worked! Sometimes you just have to know things, thanks!