OBJ transforms to points

[protean]

Hi,

I'm having a small problem getting transformations from OBJ into SOPs. The idea is to convert the layout at object level into a point cloud for copying.  I'm clearly not handling the primitive intrinsic data correctly so any pointers would be helpful.  I'm using an object merge to pack the primitives and hopefully use the the primitive intrinsic attribs to orient the copies.

Cheers

J

OBJ_to_points.hip

Edited February 1, 2017 by protean

[davpe]

well if you have identical objects and you just need to match obj transform to the SOP level, then this wrangle would work:

@P = point(1, "P", @ptnum);

first input is the original object without transform, second input is the one transformed and object merged (see the pic)

 

[protean]

Thanks. I'm not sure that helps though. I don't want to deform the objects in SOPs, I need to generate a point for each object transform at object level so I can recreate the distribution via a copy sop.

Not only that but understanding why the transform matrix is not working as I assumed it should would be beneficial as a learning experience.

Cheers

J

[davpe]

like this? check the file...

reconstructTransforms_example.hip

[protean]

Thanks!

I would say the file isn't quite working for me as pscale is 0 but I get the idea anyway. Perhaps I was overcomplicating it by using primitive intrinsics but OK.

Cheers

J

[protean]

Well I finally managed to sort out using the primitive intrinsic. This means I don't need to add any attribs to the objects and all it needs is for the object merge to pack the objects.

J

[davpe]

could you post a hip file pls? I couldn't make it work like this...

 

[dchow1992]

you can also apply the transformation after the copy sop which might give you a little more control

matrix3 x = primintrinsic(1, "transform", @ptnum);
setprimintrinsic(0, "transform", @ptnum, x);
@P = point(1, "P", @ptnum);

where input 1 is your object merge

 

[protean]

Here it is.  To be properly integrated with the packed disk primitive setup I assume 'scale' would need to be 'pscale' but it's no problem.

OBJ_to_copySop_002.hip

I had a setup to do this after the copy as you suggest which was great but the setup/tools our environment artists are using don't really allow for that. 

Edited February 2, 2017 by protean