aiuserdata gives default value all the time

[quentin.lequenne]

Hi everyone,

i'm student and i try to make my own textures, so i'm new to this.

I try to use the aiuserdata to switch color on different objects with the same shader (like here:

https://docs.arnoldrenderer.com/display/AFMUG/Ai+UserData+Shaders#AiUserDataShaders-AiUserDataColor) but it renders the default value of my aiuserdatafloat/aiuserdatacolor everytime, even if I follow every step of the documentation.

And the Extra Attributes i create appears in Shader_sphere, not in Shader_sphereShape as shown in the docs. Someone knows why ?

I'm using student version of Maya 2019 with MtoA 3.1.2

Thanks !

[Stephen.Blair · Accepted solution]

You have to add the mtoa_constant attribute to the shape node

[quentin.lequenne]

Thanks @Stephen Blair, with a search on shape nodes, i found the problem and that works !