Hi,
I have a question about Tuesday night example which is creating lots of boxes on the hill.

When applying different size of box, only one AttributeCreate node is used which create pscale attribute. And the size of boxes is acting immedietly without connect pscale to box scale attribute. Does it mean pscale is already defined in Houdini and somehow connecting to point size? How can I know which attributes are already defined in Houdini?

Thanks a lot
Frank

Hi.
if you search the help for /standard variables, ( not sure if this link will work ) http://localhost:48626/nodes/sop/standardvariables [localhost] . You will get a list of all the inbuilt variables.

Rob

Thanks for replying. Since pscale is inbuild variables, AttributeCreate node actually just expose pscale to user instead of “Creating a new user defined variable attribute” in this case. is it right?

Cheers
Frank

Attribute create is just allowing you to alter a attribute that already exists. As write values is checked on by default.

Rob

To find out about these attributes used by both Mantra Instancing and the Copy SOP check out the help for the Copy SOP as well as the following link:

http://www.sidefx.com/docs/houdini12.0/copy/instanceattrs [sidefx.com]

You can see float pscale along with vector scale for anisotropic scaling and a whole slew of others.

Also check out this fantastic sticky post created by Wolfwood here:

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=6679&highlight=instancing+attributes [sidefx.com]

Before the new viewport Instancing you would use the Copy SOP to pre visualize Instancing before rendering with mantra.