how can i convert *.pc to *.i3d

[atap3d]

Hi. I have .pc file. It was generated with Point Cloud Write VEX node. I can see lot of points inside pc file with File surface node. And I can convert it to bgeo file. But I need use it for bake my render once and read my baked data during render sequence. I can read 3d data with Texture 3D VEX node, but file format must be i3d. I know that there is one utility. Its name - i3dconvert. Its mission - to convert any data to i3d format. If I can believe in "i3dconvert -help" command, I must type "i3dconvert -t pcloud.bgeo pcloud.i3d" in terminal window. But this command has a strange output:

Warning: point 21 has bad x spacing (0.419324 not 0.285858)
Warning: point 21 has bad y spacing (0.164501 not 0.111758)
Warning: point 21 has bad z spacing (0.19356 not 0.0921745)
.....
bla bla  bla
.....
Warning: point 2853 has bad y spacing (0.0507271 not 0.111758)
Warning: point 2853 has bad z spacing (0.167755 not 0.0921745)
Warning: point 2855 has bad z spacing (0.0354023 not 0.0921745)
Segmentation fault

What's wrong in my actions? How can I get right i3d? If this is important, you can get my .pc file there.

Thank you.

[edward]

.i3d files are voxel files that expect a regular 3D grid spacing of the points. If you have .pc files, then you should use the Point Cloud VEX nodes to read them.

[atap3d]

I need bake and read such as renderman. It is very easy and fast. 1 - bake pointcloud (bake3d). 2 - convert to brickmap (brickmake). 3 - red brickmap (texture3d). How to do something similar in houdini?

[Jason]

I need bake and read such as renderman. It is very easy and fast. 1 - bake pointcloud (bake3d). 2 - convert to brickmap (brickmake). 3 - red brickmap (texture3d). How to do something similar in houdini?

You mean Houdini->Mantra? Or Houdini->Renderman?

If Mantra, is there a reason why you don't read the pointcloud directly in your shader? Do you really need to make an i3d/volume first? I think the only benefit of doing that may be to get a faster read. You could write in i3d shader or a VEX SOP to convert the point cloud to an i3d or volume.. something that perhaps would be a nice thing for SESI to include by default, actually. Do you know how to perform a point cloud query?

[atap3d]

You mean Houdini->Mantra? Or Houdini->Renderman?

I mean Houdini->Mantra

why you don't read the pointcloud directly in your shader? Do you really need to make an i3d/volume first? I think the only benefit of doing that may be to get a faster read.

In prman reading brickmaps occurs faster, than pointclouds. And if I will use the brickmaps the memory expense will be more economic. And if it hard to notice on a small scene, on big scene render will much faster. It seems to me that in mantra all will occur similarly. Am I not right?

Do you know how to perform a point cloud query?

No. How?

[atap3d]

If you have .pc files, then you should use the Point Cloud VEX nodes to read them.

I can't read my .pc data. I do not know how to do this. How can I read my .pc data? What nodes should I use for this? I can only write data.

[eetu]

I can't read my .pc data. I do not know how to do this. How can I read my .pc data? What nodes should I use for this? I can only write data.

Point Cloud Open VOP and Point Cloud Filter VOP (and other Point Cloud * VOPs)

The VOP nodes seem to be missing help pages, but the corresponding vex functions are documented.

http://www.sidefx.com/docs/houdini10.0/vex/functions/pcopen

http://www.sidefx.com/docs/houdini10.0/vex...ctions/pcfilter

and the rest in http://www.sidefx.com/docs/houdini10.0/vex/functions/

Sorry, can't find an example hip at the moment.

eetu.

[Nerox]

Maybe I'm just stupid but I just can't find the Point Cloud Write vex node. This is a Vop right?

I would like to write a pointcloud to disk, so I'm able to use it in a Vop due to closesest points/ neighbours stuff. But it seems the pcopen needs a pointcloud file, throuh the forum/point cloud write I figured I need Point Cloud Write. But for what ever reason I'm not able to find it.