Vray RT issues

[beenyweenies]

I'm doing some testing in RT, and have a couple of questions:

1. If I turn off an object's primary visibility in order to render it separately but maintain its shadow, reflections and light interactions in my base plate, the object's self-shadows appear in the render whereas they do not in a normal Vray render. I'm not aware of a self-shadow toggle, is there a setting I'm missing?

2. Occasionally my RT renders will just give up with no messages or info given. Is this is a known issue, related to heat issues with the card or ?

3. Is there a public roadmap for RT feature support going forward?


I will probably have other questions soon, I'm doing a lot of RealFlow work and using RT brings my render times from 1.5 hours per frame to 3 MINUTES per frame. No joke.


I would have posted this in the RT beta category, but that seems largely abandoned since it is labeled for the beta.

[savage309]

CPU or GPU ?

[beenyweenies]

Sorry, GPU, CUDA-based.

Not sure if it matters, but at work I'm using a dedicated Tesla for RT rendering, and at home I'm using a GTX 980 TI. Mid-level Quadros for displays on both systems.

[ricoholmes]

A huge secondary vote for a public roadmap of RT GPU features here

[vlado]

A huge secondary vote for a public roadmap of RT GPU features here

How would that help you? Even if we publish a roadmap, chances are we are not going to stick to it - priorities change constantly depending on what clients need for their particular projects.

Best regards,
Vlado

[ricoholmes]

"chances are we are not going to stick to it" I just love the honesty
("I like deadlines.. it's the whooshing sound they make as they pass by" - Douglas Adams)

Actually Vlado you're right of course. I was thinking more broad strokes (GPU RT round edges, not before summer 2016) so as to cater for that with our upcoming projects lineup. Basically just being a pest.

[vlado]

I was thinking more broad strokes (GPU RT round edges, not before summer 2016) so as to cater for that with our upcoming projects lineup.

There are two features in SP3 that didn't get full GPU support - the rounded edges (needs separate bump slot) and the triplanar texture, and work on these is underway.

Stability seems to have become an issue recently and we must spend some time to stabilize the code.

At some point, we also want to rework the code into a multi-kernel version that would allow us to render larger and more complex scenes efficiently.

Procedural bumps are high on the priority list, although having the triplanar texture might mitigate this to some extent.

We will need to work on support for some new features in upcoming Autodesk releases.

There are a few relatively easy opportunities for optimizing the code, so we must look into that as well.

Best regards,
Vlado

[ricoholmes]

Thank you, just what we needed bang on .

[savage309]

In Maya V-Ray spawns a new process when you do IPR rendering (vray.exe). The log of the render is in this separate process and if it has stopped working it should notify you there (with a reason). We have no such known-issue and if you have a scene that reproduces the issue after some time it would help. V-Ray usually uses the GPUs to the max (and they happen to get hot), but it is the hardware job to cool itself. You can monitor the GPUs temperature using (free) 3rd party tools like MSI Afterburner or EVGA precession.

I think the issue you have with the self shadowing is a bug and I will add it to the bug tracker. Thanks for the repot!

[a7az0th]

Hi beenyweenies,

I am looking into the issue with the primary visibility and self-shadowing you mentioned, but I am not able to recreate it. Maybe I am not looking at the same thing. Can you please share a scene?