UV Tiles: Clamping displacment

[ndeboar]

Hey,

I'm using the $U $V variables to load in two uv tiles (1_1, 2_1). When I load up a single tile with out the variables, the displacment looks fine, but when i use the variables, my displacment looks clamped. I tested normal and 2d displacment, both suffered from this. I've attached an example. I have enabled negative colors, we are using 32bit displacments.


Vray for Maya 2.00.04
Maya 2011

Any ideas?

Cheers!

Nicko

[vlado]

You need to manually adjust the min/max displacement bounds in the V-Ray displacement control attributes. With a single file, V-Ray can figure out the bounds automatically, but with tiles it doesn't even know what files to look at until they are actually loaded.

Best regards,
Vlado

[ndeboar]

Ok, ill do some more tests.

Nick

[ndeboar]

Did some tests

Normal displacement:
Even with my bounds set at -5000,+5000, my displacement is getting clamped. Also, my second tile is displacing way more than my first one.

2d displacement:
Bounds are disabled, yet my displacement is still clamped. Second tile isn't causing any problems here.

So, neither option seems to work?

[vlado]

Did you also enable the "allow negative shader colors" option in the V-Ray global options (I'm thinking we should enable this by default...)

Best regards,
Vlado

[ndeboar]

Sure did, i might make a managable test scene and up load it. It looks totally fine setting the bounds manually, but it clamps as soon as I add another tile.

[vlado]

Yes, in that case a scene will be helpful, as it works fine here in my simple tests.

Best regards,
Vlado

[Morbid Angel]

just curious how do you add other tiles? are you physically loading another filenode, or are you using a tile tag? what if you try loading them using filenodes and see if that works?

[ndeboar]

just curious how do you add other tiles? are you physically loading another filenode, or are you using a tile tag? what if you try loading them using filenodes and see if that works?

We are using the tile tag. If we load them individualy, it works fine, its just the tile variable that seems to clamp them.

[Morbid Angel]

well Im looking at out setup right now, we actually have allow negative color in the file texture as oppose to the vray globals. Try that. It seems to work fine for us.