An assortment of OSL shaders for your perusal

[Rens]

And the third!

Merge2
Merge two inputs using Nuke-style operations.



Links
Page:
http://www.rensheeren.com/blog/osl-merge2/
Download link:
http://www.rensheeren.com/osl/merge2_tex_v001.osl

Features
- Merge two inputs.
- Takes alpha channels into account.

How to use
– Create a VRay OSL Texture map.
– Load in the downloaded .osl shader.
– Connect the inputs to merge.
– Set the mode.

[Rens]

I think you'll like this one.

CamMapScale
Scales an image to the original image ratio when using Camera Map Per Pixel, instead of the annoying 'feature' where it scales the image to the render output size.
So if you have a square image, you can project a square image!



Links
Page:
http://www.rensheeren.com/blog/osl-cammapscale/
Download link:
http://www.rensheeren.com/osl/camMapScale_tex_v001.osl

Features
– Scales the input image back to its original aspect ratio when using Camera Map Per Pixel.

How to use
– Create a VRay OSL Texture map.
– Load in the download OSL shader.
– Plug in the map and set your render and map resolution. The shader will scale the image back to the map resolution.
– Make sure ‘wrap texture coordinates’ (General tab) is disabled in the OSL shader!

[sharktacos]

This is great Rens! So glad I found it this thread!

Vlado, would it be possible to make a forum board for OSL? Typing "OSL" in the search results in "Sorry - no matches. Please try some different terms." It would be awesome to have a central place where we can all share this OSL goodness (and a place where we could find it too!). I'd suggest that the OSL board be for all applications, not just Max or Maya.

[sharktacos]

Very cool Rens.
I'm using your mixNormalMaps map allmost every day. You really deserve your entry
Looking forward to try this one and see your library grow.

Has this been posted yet? Maybe I missed it...

[Ihno]

@sharktacos
You can find it here:
http://forums.chaosgroup.com/showthr...ng+normal+maps

@Rens:
Cool stuff, keep it up.

[Rens]

Cheers guys!

Sharktacos, I think you can search for *OSL* or "OSL", that should work.

Here's the mixNormalMaps shader updated to match the others, with a page and everything:


MixNormalMaps
A shader for mixing or blending together normal maps as outlined on this page:
http://blog.selfshadow.com/publicati...ing-in-detail/
This gives much better results than simply blending or using overlay mode on two normal maps. It uses Reoriented Normal Mapping as described in the article as well as the idea from the second comment, by "jarkko" in that article. The modes are fairly similar in results.



Links
Page:
http://www.rensheeren.com/blog/osl-mixnormalmaps/
Download link:
http://www.rensheeren.com/osl/mixNor...s_tex_v003.osl
http://www.rensheeren.com/osl/rhfunctions.h
Right-click and save both in the same folder, both are needed for the shader to work. Overwrite rhfunctions.h if asked.

Features
- Blends two normal maps.
- Two algorithms available.
- With mix amount to define the second map blend strength.

How to use
- Create a VRay OSL Texture map.
- Load in the downloaded OSL shader.
- Plug in two normal maps.
- You can then set the mode and mix amount.

[Rens]

ChannelSwitcher
An OSL shader for switching channels. You input two textures and then you can shuffle the RGBA channels around to make a new output. So for example you could have the red and green channels of texture A, green as a black output, and the alpha from texture B. Or, as good example, you could switch all the channels to use the red channel, so you'd have a monochrome output.
Or shuffle the alpha into RGB and adjust it, then shuffle it back.



Links
Page:
http://www.rensheeren.com/blog/osl-channelswitcher/
Download link:
http://www.rensheeren.com/osl/channe...r_tex_v002.osl
Right-click and save.

Features
- Switch or shuffle the channels from two inputs around.
- You also choose fill white or black for a channel.
- Or invert the channel.

How to use
- Create a VRay OSL Texture map.
- Load in the downloaded OSL shader.
- Plug in two maps, and set the switch modes.

Modes:
1 - red1
2 - green1
3 - blue1
4 - alpha1
5 - red2
6 - green2
7 - blue2
8 - alpha2
9 - one
10 - zero

[sharktacos]

Awesome stuff Rens!

[sharktacos]

Hey Rens, do you know of a way to make OSL attributes greyed out? For example, on the VrayMtl the "highlight glossiness" is greyed out as long as the "lock" is on. I'm wondering if it possible to do something similar in OSL?

[Rens]

Hey! No I don't think OSL specifies anything like that, unfortunately.

[sharktacos]

Hey! No I don't think OSL specifies anything like that, unfortunately.

I was afraid of that . On a related note, I see you have #ifdef __VRAY_OSL__ calls on many of your OSL shaders. Do you know if there is a way to specify with a similar call whether one is using OSL for Vray with Max as opposed to OSL for Vray with Maya? The syntax of how one needs to write OSL stuff for Maya and Max differs so it would be useful to specify.

p.s. Where did you learn about the #ifdef __VRAY_OSL__ call? I don't recall seeing it in the docs.

[Rens]

I was afraid of that . On a related note, I see you have #ifdef __VRAY_OSL__ calls on many of your OSL shaders. Do you know if there is a way to specify with a similar call whether one is using OSL for Vray with Max as opposed to OSL for Vray with Maya? The syntax of how one needs to write OSL stuff for Maya and Max differs so it would be useful to specify.

p.s. Where did you learn about the #ifdef __VRAY_OSL__ call? I don't recall seeing it in the docs.

I found it here:
http://docs.chaosgroup.com/display/V...ationSpecifics
And there's a bit in the OSL docs saying they support the standard C preproc calls.

The #ifdef preprocessor just checks if __VRAY_OSL__ is defined, which it would be when rendering with VRay.
I haven't tested these shaders with maya, but does it use colour inputs instead of texture inputs? Or how exactly does the code differ for max and maya?
Basically that is what the preprocessor bit is for, it will rewrite the code to fit the renderer, it preprocesses the code/script before it gets compiled. So for VRay it would use texture inputs (UVs yay!) instead of colour inputs. Unfortunately I don't think you can see if it's maya or max. And yes that would be very useful!


Vlado / Chaosgroup, is there a definition to distinguish between the VRay platform used?

[^Lele^]

holy moly, Rens, you've been busy!
Fantastic stuff!

[Rens]

holy moly, Rens, you've been busy!
Fantastic stuff!

It's true!
Thanks Lele! You're keeping yourself busy as well I see!

[vlado]

Vlado / Chaosgroup, is there a definition to distinguish between the VRay platform used?

Unfortunately, no. What are the differences that you find between the Max and Maya implementations?

Best regards,
Vlado