VRay RenderToTexture broken?

[Igor]

Hello ChaosGroup, all,

i searched here a bit but couldn't find anything - we have a problem with Render to Textre here.

It seems it doesn't work - it bakes only the primary object, ignoring the projection modifier. I get always only the black or gray low poly bake, instead of the complete baked structure from the projected high poly geometry objects. Even if I set correct VRAY_render_element, i always get the the empty, non projected texture.

I hope i have missed something
In use: VRAY 1.5 RC3, Max2009+2010 32 & 64 bit.


thanks a lot in advance!

Igor Posavec
3d-io.com

[jacksc02]

from the spot3d help-
V-Ray provides support for the texture baking mode of 3ds Max. You can use V-Ray as a texture-baking renderer; however since VRay does not support the standard 3ds Max Render Elements, you need to use the V-Ray specific ones (e.g. VRayCompleteMap instead of CompleteMap etc).

Is that how you are doing it?

[Igor]

wont work

Hi Jacks!
thank you for the feedback and help!
This is unfortunately not the solution.

The problem and the question is if VRAY renderes projection mapping. And if yes, how?

Here is the short illustrated example (s. below). I know the biggest (game) studios work with VRay, and i know they render highpoly to low poly with render-to-texture and projection mapping. I must be missing something

Scanline / FinalRender / MentalRay rendering:




Vray rendering:



thanks for the ideas

[vlado]

V-Ray does not render the projection mapping at present.

Best regards,
Vlado

[Igor]

thanks Vlado, i found already this answer from you in 2007, but i hoped the new version made it possible

We have an extremly high number of VRay Users using our FlatIron software (http://flatiron.3d-plugin.com/) for complete scene texture baking of game levels or architecture models... and from all renderer we have the biggest problems with VRay since it doesn't support ProjectionMapping (so we used a work around which is: ) and by direct baking it render each object in a separate pass. This means, if the scene has 100 objects, it render each one separately on the map - what makes Vray 100 times slower then other renderer doing it in a single pass.
Since the anger of our users by is getting stronger for not supporting VRay (and i don't see how), I must ask if there is a way for either projection mapping support or some possibility to send the whole scene objects to the VRay renderer and render then in a single pass.

If you didn't understand what i wrote here (it is a bit abstract), i could ask a programmer here to send you directly a mail with the problem description, if it is ok?

thanks in advance!
best regards

[vlado]

I've already added both of these as feature requests so hopefully they will make into one of the next builds.

Best regards,
Vlado

[Igor]

Thanks Vlado, i really appriciate it!!
best regards

[Neilg]

I've just spent the morning looking into flatiron, couldnt figure out why this was happening.

+1 for the feature request, doing normal maps in scanline and then going back to vray is a mess.

[Morbid Angel]

+1 for the feature request, doing normal maps in scanline and then going back to vray is a mess.

why is it a mess? you could potentially try mr.

[vlado]

why is it a mess? you could potentially try mr.

mental ray has its own issues with projection mapping; for a simple scene, I got artifacts in the result both in 3ds Max 2009, and in 3ds Max 2010, whereas scanline rendered fine.

Best regards,
Vlado

[Morbid Angel]

interesting. Well personally I wouldn't use any of these methods. Instead I would export a model to mudbox and bake there, works every time

[Igor]

MR projection

mental ray has its own issues with projection mapping; for a simple scene, I got artifacts in the result both in 3ds Max 2009, and in 3ds Max 2010, whereas scanline rendered fine.
Vlado

Hi Vlado,

Yes, we have expirienced them too, but it is solved now. We have just "cracked" mentalray ind FlatIron 1.5 (coming out next week) - it is now possible to render countless objects in a single map in one pass into any UW Channel with and without projection mapping without any problems, just like with Scanline (ok - we worked 3 months to find the backdoor, and had to rewrite the standard RenderToTexture).

MR, Scanline and FinalRender are now unified, only VRay and Brazill remain (and this is terrible since most of our customers are VRay film- and architecture studios); we shot at Vray from all weapons and from all angles, yet we are unable without SDK to hook directly into the render engine and settings - the workaround like by MR didn't work.

Thanks in advance for the future release with this additional correction!
best regards

[vlado]

I've done some work on supporting projection mapping for the next update; if you are interested in testing this, please email me to vlado@chaosgroup.com

Best regards,
Vlado