attribute vop/wrangle solver sop question

[genesys]

Hello,

I currently am having an issue evaluating with stating "if value of attribute X was 1 on previous frame, it will be 1 on current frame."

I'm not great with VEX coding, but thought it would be good to discover solution. I have inside of a solver sop current frame in input1 and previous in input2. 

In an attribute vop, I compare said attribute by dropping two getattrib > compare previous to current greater than > ....if begin and end blocks are where I am stuck.

Any advices will be appreciated.

**edit**

I can't upload a file at moment, but will later when home. It seems basic but having difficulties with. Thanks you for any help. I will continue to solve in meantime.

Edited June 9, 2016 by genesys

[f1480187]

Works well for me.

 

keep_value_solver.hipnc

Edited June 9, 2016 by f1480187

[outtacontex]

Try this. 

Throw down an attribute wrangle inside of your sop solver. Make sure the "current frame" is in the first input, "previous frame" in your second input. 

i@attribute;

@attribute = max(@attribute, point(1, "attribute", @ptnum)); 

This should work if your values are just between 0 and 1 for your point attribute. Let me know if you need explanation on the text. 

 

[mestela]

This post has a wrangle that does a similar thing:

 

http://forums.odforce.net/topic/25884-houdini-dop-inherit-velocity/#comment-150391

 

[genesys]

Thank you all. All of the methods mentioned gave me results I was after. 

@mestela

I actually had to implement similar with velocity. I just manage to do it in sops with a point cloud, transferring the vel from animated geo to fracture points.