adding a tranform sop changes Cd values

[jonathantopf]

Hi there, Im playing with some simple hou scenes and im getting some interesting behaviour. I'm new to hou so its probably obvious whats going on, im just getting used to things

 

In the attached scene I have a copy sop duplicating a cube across a line. I stamp the $PT num attribute and use it to set the cubes Cd value. But when I add a transform under the cube the Cd values change. I guess it makes sense, cd is just a simple vector like position that can be transformed but its not the desired behaviour. 

 

Is there a way to tell the transform sop to only transform point and normal data?

 

Cheers

 

jt

copy.hipnc

[magneto]

It's because you created Cd as a vector. Change it to float and set the size to 3, so float[3].

[jonathantopf]

Ahhaaa, makes sense ofcourse

 

Thanks!

[Skybar]

It's quite strange though. The color only changes with rotating in Y and Z, as well as scaling in X. 

[jonathantopf]

i think this is as only the red, i.e x channel is non zero, so if you transform along the x axis then you are transforming two 0's which will when rotating  will always be 0, very clever actually, I never thought of a color in this way before

[magneto]

Also AFAIK usage of vector type is discouraged, and is only there for backwards compatibility. You can use the type qualifier near the Type parameter.