Weird Prob with PaintFX

[sigma]

WTF, Ive never seen that before. What video card are you using?
Its probably not the card but Im just curious. Im sure Duncan Brinsmead at Alias can answer your question. You can ask him on the Alias Email List Server. Sign up here http://www.highend3d.com/maya/listserver/

[Faeroon]

Damn... found the source of this thing.:eek:

I've recreated the prob in a new scene, with the
same lights as in my scene, a nurbs plane and just a quick
paintfx grass stroke on it.

So here's what I've got:

http://arctic.unitedforcesofseed.com/contest/specularity.jpg

PaintFX doesnt like my shadowmap and "real lights" (at the
illumination attrib window) turned on.
Somehow he cant calculate it or wtf....
The problem is "solved" if you turn off the specularity!
With specularity set to 0 none of those strange red thingies appear.

Mika P. thought that rendering the color /shadow layer seperatly and compositing them
with PS could solve the prob, so that the specularity can be kept
turned on.
Now I've got to learn how to do that :p

PS: Does anyone know some good "rendering passes/layers in Maya" tutorials?

[Duncan]

Paint effects is having problems because of your negative intensity light. I've entered a bug to clip the light values in paint effects to positive values( negative values wrap around in the 0-255 color space causing the observed colors ). Note that the problem also occurs if the specular is zero, although it can be more obvious on the highlights.

You might consider texturing your primary light sources rather than sucking light out with a secondary negative light. Negative lights are useful, but there is a variety of unnatural artifacts that they can cause. Also one should generally turn off emit specular on negative lights to avoid black spots(negative highlights).

Duncan

[Grooveholmes]

Duncan... :bowdown:

[graphiouz]

Duncan B,:bowdown:

.

[Faeroon]

Thx alot Duncan :bowdown:
I've done some testrendering with the shadowmap
connected to my normal light - I've deleted the negative one
and it seems that you're right
=> no red shitty damn digi-shrooms on my PFX Grass!!!

Thank you very much - you've saved my day! :applause: :thumbsup:

[Duncan]

Glad to help. Your detailed post helped me fix a bug.

:beer:

Duncan

[Faeroon]

Hehe nevermind :D
Just call me "Bugcatcher" ;)

*is so glad that this thing is solved*

[Jack Youngblood]

I know that this is an old thread but hopefully someone can help me. Duncan says to try 'texturing your light' as an alternative to negative lighting. How is this done?

Desperate to know and thanks in advance.

[Jack Youngblood]

Ha ha! He means pre light!

Thanks.

[Duncan]

I know that this is an old thread but hopefully someone can help me. Duncan says to try 'texturing your light' as an alternative to negative lighting. How is this done?

Desperate to know and thanks in advance.

I simply meant mapping a texture to the light color. (click on the box in the attr editor next to the color swatch or right mouse over the attribute name )

Duncan

[Jack Youngblood]

We Hoo! Discoverd a possible fix for this....

Instead of a negative light try:

make an ordinary light
make its light color = black
Set its shadow color to -1r, -1g, -1b


This functions the same as a negative light but only uses 1 light. No weird artifacts (so far) in pfx. Not my solution. Guy called anopheles who seems to be some sort of resident lighting wizard.

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