7 replies to this topic

[renderfan]

I am looking for way to find minimum bounding box of geometry because i want to reorient the geometry to best orientation. For this i would like to use bounding box. I found Oriented Bounding Box in Bound-SOP but this does not work allways right. For example if i have box or simple geometry and want best bounding box then it produces sometimes not very good result.

Sorry for so many questions.

[rich_lord]

Some SOPs(like Transform) have the $XMIN, $YMIN and $ZMIN local variables to get the minimum bounding box of the input geo.

Theres also the bbox function which you can use to get bounding box information. I think you use it like this :-   bbox("surfaceNode", D_XMIN) to get the minimum X of the bounding box.

Im not sure if these methods will return a better bounding box than the bound SOP though. I havent played with any of this too much.

[renderfan]

Dear rich-lord thank you for reply!
I think i must be more clear with what i want. I know about the expressions to get min or max of bounding box but i search for Bounding Box with minimum volume. The Oriented Bounding Box Sop does not allways output good result. For example with some 2D-Shapes i have problems. How can i improve this?

Thank you very much!

[petz]

OOBB usually does a good job in houdini! could you upload a file where i doesn´t?

[renderfan]

Dear Petz,
I upload file where Bounding Box does not work right.

Thank you!!

Attached Files

•  BoundingBox.hipnc   61.58K   30 downloads

[renderfan]

Nobody knows solution?
Please help me!

Thank you very much!!

[vectorblur]

renderfan, on 20 February 2012 - 07:19 AM, said:

Nobody knows solution?

http://forums.odforc...d-bounding-box/

Follow this thread and you will know there are folks who fathered OBBs using eigenvectors.

Cheers,

[petz]

Follow this thread and you will know there are folks who fathered OBBs using eigenvectors.

oobb pretty much allways rely on eigenvectors.

@renderfan
file is attached. its not really an elegant solution but should do the job. at least as long as you don´t have a much higher polycount.

hth.
petz

Attached Files

•  BoundingBox_new.hipnc   82.89K   39 downloads