Mental Ray Problems Rendering Particles (fire)

[bishop00s]

Hey guys...

Using a basic fire particles effect in my project. When I render it in Maya the particles look great (like fire) but when I render in Mental Ray there are lines in the fire (almost like the blobs are rendering too small so they aren't blobbing together.)

Any suggestions? I'd really like them to render in MR.

Mental Ray

Maya

[joojaa]

actualy it looks more like the post glow settings! And rather than blob treshold its more that the GLOW is differently sized. What version of maya?

YOu arent by any chance trying to diplace the blobs? Alo note maya renders teh blobs implicitly byt mr does it a bit differently by triangulatig the so you may maybeneed to adjust tesselation.

[bishop00s]

Using Maya 7.0

Nope not trying to displace the blobs or anything. I think the blobs are also a little smaller in Mental Ray.

I'll give increasing the tessellation a little bit and see what happens. You mean increasing it on the geo connector?

Thanks,
Robert

[bishop00s]

My mistake they aren't blob surfaces but clouds.

Anyway, I tried increasing the tessellation on the geoconnector, and that didn't help.

Increasing the Radius seems to help. Just surprised I had to change that to correct the look in Mental Ray.

Any other thoughts would be welcome though.

Thanks.

[bishop00s]

Yea even with the increased radius I'm still getting very visible lines in the fire with MR.

Not sure what's going on.

Here look for yourself.

[joojaa]

posta file thet exprssily shows the roblem and delete the rest!

[bishop00s]

www.sprynthesis.com/particle\_test.ma.zip

[joojaa]

Oh this, it has nothing to do with tesselation or blob size, or geometry even. ITs just that the shader expression dont evaluate oiver to mr all that well. Se not 100% of mayas shading capability is going to port to mr even if you wanted to. IN this case its a known limitation. In this case its that teh 3d texture does not flow trough the shape in teh same way as it does in maya software but rether each blob stamps the same picture.

YOu could try using a nodenetwork taht uses a bit different nodes.

[bishop00s]

aha!

Hey thanks a lot!

Robert