VOP SOP inputs

[nomad]

Hello everyone !

Is there any way to define the second input inside the VOP SOP node for blending first and second inputs together?

There are very useful presentation by Andy Boyd, I am trying to recreate something similar to the tree.

http://www.a3d.co.uk/siggraph_talk/img30.html

Probably he used VOP SOP to blend between two inputs.

It can be done with blend regions operator or any similar...

But how did he define the second input inside the vop SOP ?? I cannot find any import node for it.

thank you

[graham]

To get info from inputs > 1, you have to use Import Attribute Vops.

See the attached file.

In order to get the positions from the 2nd input, import the P attribute, set the ptnum for that import to be the same ptnum as the first input geo and then just blend them with a mix vop.

vopsop_blend_position.hip

[nomad]

thank you graham,

you helped a lot

[nomad]

Continue to learn houdini's procedural secrets ..

The aim is to blend the shapes along their Y axis.

The solution i reached is to mix two shapes controlled by color bias transfering from the line sop.

i dont think it is the right solution. And i am shure it is not the best one.. it looks a bit of stumbling...

Can you point me on more rational way to do that ?

thanks again ..

and sorry for borrowing your time ..

tree_1.rar

Edited December 7, 2008 by nomad

[anim]

it's all in the slides you refered

color red = $BBY

so instead of your's attrib transfet node use point sop, change Keep Color to Add color and in color red type $BBY instead of $CR which is there

you can also type (1-$BBY) to invert the gradient

or you can use much cleaner approach since you are using mountain SOP which is VEX based

you can directly override height parameter of the moutain SOP with an attribute

so connect your tube into attribcreate SOP, name the attribute "height" and in value type $BBY or (1-$BBY)

to multiply the height use e.g 1.3*$BBY, you have to do it here because the height slider in mountain SOP won't be doing anything now

now connect this attribcreate SOP into mountain SOP and you are done, no need for blending in VOPs unless you need more control

[nomad]

anim thank you for explanation, it is really helpful !

the clearer result with much flexibility way