render point colour

[glyph]

is it possible to render a colour applied with the point sop (with mantra) without using a shop shader ?

- the shop shader slows the whole thing done a lot as the rgb vals are modified from a copy sop and applied to over 1000 bits of geometry

thanks mark

[stevenong]

Hey Mark,

The Point SOP is pretty slow so I would suggest using a Vex SOP because it is really fast, if you are comfortable with that.

Also, you don't have to put down a Shader SOP because applying the shader at the Object level should pick up the point colours unless you're using stamping with the shader.

Depending on the shader you're using, it might be looking for the "diff" attribute rather than "Cd". If this is so, then append an Attribute SOP after the Point SOP & in the Rename parameter, type "Cd" under the "From" column & "diff" under the "To" column.

Alternatively, can you please post your hip or a screen capture of the SOP network you're using?

Cheers!

steven

[glyph]

thanks Steven

yes I am using stamping! but renaming the attribute has speeded it up..

how come when I copied the add color param and then looked at the name in the copied note pop up it said: ".../diffr"

but mmb on the sop shows Cd attributes?

mark

[stevenong]

Hey Mark,

One more option to speed things up is to check "Use indirect references" in the Shader SOP. This prevents Houdini from cooking whenever you make a change as it is trying to update the geometry. If you need to check the stamping, you have to uncheck it. The same might (most likely will) happen when rendering where you have to uncheck it. In this situation, I'll set up a pre-render script to uncheck it then check it again with a post render script. It'll make your life better.

"Cd" is the name of the colour attribute while diffr, diffg & diffb are the name of the channels. Does this help?

Cheers!

steven