Facing Ratio to X, Y or Z

[Digit]

What are you trying to achieve? maybe theres another way of doing it...

[akewt]

i havent actually got anything specific atm but its always something i've needed in the past for shading. there just dosent seem to be a decent fresnel node of shader anywhere.

i think you would say, its the state of a point on any surface which is decided by the surface direction according to either a light, camera, x,y,z or object/locator. whether its perpendicular or parallel.

[Pixero]

If your using Mentalray I have just the thing for you. :thumbsup:
Take a look at JS_Incidence in the download section of my site.
There is also a short tutorial in the tutorial section.

[akewt]

hehehehehhehe! thanks pixero. it is exactly what need if im using mental ray (used many times before and is in my shader lib). but im using turtle and need to use maya native nodes.....

is it possible to get light incidence in maya s/w?

[Pixero]

I´m not in front of Maya at the moment so I cant check, but have you tried the surface luminance node? Not a perfect solution but it gives you the part of an object that is illuminated by a light. Wouldn´t that be the direction toward the light...sort of ?

[Jozvex]

is it possible to get light incidence in maya s/w?

The Ramp Shader (not the ramp 2d texture) can do that.

I hope Turtle supports the Ramp Shader!!

[BillSpradlin]

The clearcoat node also has fresnel, not sure if Turtle will suport it or not.

[Pixero]

Just had to try and found a way with just maya shaders:

http://www.pixero.com/stuff/lightdirection.jpg


Connect:

spotLightShape1.worldMatrix[0] to lightInfo1.worldMatrix
lightInfo1.lightPosition to multiplyDivide.input1
(You could also connect translate of a Locator instead of the lightInfo.)

samplerInfo1.pointObj to multiplyDivide.input2

Here it gets a little tricky to do by hand. Easiest way is to execute these three lines in the script editor:

connectAttr -f multiplyDivide1.outputX plusMinusAverage1.input1D[0];
connectAttr -f multiplyDivide1.outputY plusMinusAverage1.input1D[1];
connectAttr -f multiplyDivide1.outputZ plusMinusAverage1.input1D[2];

plusMinusAverage1.output1D to blender of a blend colors.
Finally connect the blend colors to color of the material shader.

Hope this helps!

Jan

[frogspasm]

Hi Jan,

I tried rendering your tutorial file for the incindence shader, but I get an error saying:

API 0.0 error 301041: incorrect member "Gain", "JS_Incidence" does not return a struct

This happened in 6.0 and 6.5
Could you think of what would cause that error?

Thanks,

~Mike D.

[frogspasm]

OK, scratch that.
For some reason in the sample file the JS_Incidence bias was hooked up to the JS_BlendColors Blender value. Don't know how it could have gotten that way. When I break that connection it won't let me connect it back again. I just connected the outValue to the Blender value an it works fine.

~Mike D.

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