I haven’t had much time to dig into OSL and what the capabilities / limitations are… but I’m reading that the next Renderman (19) will have support for it and Blender’s Cycles already has it. If I’m not wrong V-Ray 3 will also have some support for OSL: Chaos Docs So, let’s play with the idea that …

Cool. What is the OSL code to call this functionality?

So I’m messing around with angle blends and seem to have re-created the different interpolation types of a Maya ramp in OSL (i.e. a ramp with the facing ratio of a sampler info connected to its V coord). Here’s what I came up with: **Linear** float facingRatio = 1 - abs(dot(I, N)); **Expo…

The same as in the cook_torrance.osl shader - calling gettextureinfo to get the number of channels. Now it works as expected out of the box.

Our implementation of the Ramp texture is included in the \samples\vray_plugins\textures\tex_Ramp.cpp file in the V-Ray SDK. However I don’t think we’ve coded all the different types that Maya has. You should generally ask Autodesk about more info. Best regards, Vlado

Thanks Vlado. I’m more interested in the interpolations used in the VrayVR Mat shader (Sigmoid, Gompertz, Polynomial, etc), rather than the Maya ones. Where would I find the code for that? is it also in the V-Ray SDK samples?

No, it’s not in the public SDK. I’m attaching the code here - let me know if you need something else. Best regards, Vlado vray_mtlangleblend.zip (4.57 KB)

Awesome, thanks! :slight_smile:

These are issues I brought up in another thread but after exploring OSL for a couple of days, the two big limitations I have found are: -Inability to output arbitrary values from the shader as render elements. All the closure outputs work but it’s often desirable to output arbitrary values. -Inabi…

Can you tell us what kind of data you want to store in Render Elements from OSL you could not do at the moment? The problem with the string parameters no allowing you to read files directly might be lifted in a future version.

OSL – strengths and limitations

V-Ray V-Ray for Maya General

sharktacos July 7, 2015, 8:29pm 30

Great, thanks.

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OSL – strengths and limitations

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