Oconv creating non valid .oct file

1

Hi There,

I’ve taken an obj export from revit and attempted to run oconv to create an octree to render a scene. I do not get any warning messages in the terminal but the resulting octree does not open in accelerad for viewing.

The following code is used to convert the obj file to rad

obj2rad 222050_R22_86_COWLES_RD.obj > 222050_R22_86_COWLES_RD.rad

the following code is then used to compile the octree.

oconv -f Jun21_1200_ss.sky 222050_R22_86_COWLES_RD_radiance.mtl 222050_R22_86_COWLES_RD.rad > test.oct

I do not received any errors here, can you help me understand why the octree is not valid.

See raw files here. sharefolder - Google Drive

2

You have to use Google Drive or a similar service to share large files.

What error message do you get when you try to use the octree? Have you tried using it with rpict?

-Greg

3

This is the error i get with rpict

PS C:\VE Projects\! - code\Run 1\1_obj_and_sky_to_oct> rpict test.oct > test.hdr
rpict: fatal - (test.oct): not an octree
rpict: 0 rays, 0.00% after 0.0000 hours
PS C:\VE Projects\! - code\Run 1\1_obj_and_sky_to_oct>

I have attached the google drive link to the source files in the original post.

4

Your environment is somehow causing the output to be in a 16-bit/character format rather than pure binary. Here is the output of the first few bytes using “hexdump -c”:

0000000   <FF>   <FE>   #  \0   ?  \0   R  \0   A  \0   D  \0   I  \0   A  \0
0000010   N  \0   C  \0   E  \0  \r  \0  \n  \0   o  \0   c  \0   o  \0
0000020   n  \0   v  \0      \0   -  \0   f  \0      \0   J  \0   u  \0
0000030   n  \0   2  \0   1  \0   _  \0   1  \0   2  \0   0  \0   0  \0
0000040   _  \0   s  \0   s  \0   .  \0   s  \0   k  \0   y  \0      \0
0000050   2  \0   2  \0   2  \0   0  \0   5  \0   0  \0   _  \0   R  \0
0000060   2  \0   2  \0   _  \0   8  \0   6  \0   _  \0   C  \0   O  \0

A similar problem was posted here.

Cheers,
-Greg

5

Hi @Greg_Ward,

So here, the .mtl file can replace the .mat file to achieve the material definition.

Cheers,
Hao

6

Unfortunately, Radiance materials have very different definitions than other graphics packages, so the .mtl file you have will not serve as part of the Radiance scene description. You will have to replace the materials with your own definitions, or ones gleaned from other Radiance data sets.

Best,
-Greg

7

Oh, sorry for my foolish question. I thought the errors were caused by the fact that the mtl file was used to replace the material file.

Cheers,
Hao

8

No, the problem is caused by using the PowerShell with default output configured, as explained in the other post I referenced in my reply. You need to change the PowerShell’s settings or use some other command-line interface.

Cheers,
-Greg

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9

Thank you Greg,

I am using the command prompt in vs code now instead of Powershell and it worked perfectly.

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