How to: Make a volume using OsgVolume

 

Create a script as below substituting .tif for the image type you are using ie: .jpg .png etc. Currently there is a maximum of 256 images/slices supported.

 

 

To create the script open a new document in BBedit and paste the following text into it

---

#!/bin/sh

 

osgvolume --images *.tif --num-components 1 --r_maxTextureSize 512 -n --zMultiplier -1.0 -o volume.ive

 

echo make volume complete

 

exit 0

---

 

 

and save it into the directory where your image files are, with a name like:

 

make_volume

 

then change permissions of the file - use terminal and go to the directory and do:

 

 

Now if you type :

 

 

this will create a file called volume.ive

 

---

You can also do part volumes by using the following and changing the **** part:

---

 

Other options

 

for help :

 

osgvolume --help

Usage: osgvolume [options] filename ...

 

Options:

 

-h or --help Display this information

 

-s <numSlices> Number of slices to create.

 

-n Create normal map for per voxel lighting.

 

 

--clip <ratio> clip volume as a ratio, 0.0 clip all, 1.0 clip none.

 

--compressed Enable the usage of compressed textures.

 

--compressed-arb Enable the usage of OpenGL ARB compressed textures.

 

--compressed-dxt1 Enable the usage of S3TC DXT1 compressed textures.

 

--compressed-dxt3 Enable the usage of S3TC DXT3 compressed textures.

 

--compressed-dxt5 Enable the usage of S3TC DXT5 compressed textures.

 

--images [filenames] Specify a stack of 2d images to build the 3d volume from.

 

--maxTextureSize <size> Set the texture maximum resolution in the s,t,r (x,y,z) dimensions.

 

--num-components <num> Set the number of components to in he target image.

 

 

--r_maxTextureSize <size> Set the texture maximum resolution in the r (z) dimension.

 

--s_maxTextureSize <size> Set the texture maximum resolution in the s (x) dimension.

 

--t_maxTextureSize <size> Set the texture maximum resolution in the t (y) dimension.

 

 

--modulate-alpha-by-luminance For each pixel multiply the alpha value by the luminance.

 

--replace-alpha-with-luminance For each pixel m Set the alpha value to the luminance.

 

 

--shader Use OpenGL Shading Language.

 

 

--xMultiplier <multiplier> Tex coord x mulitplier.

 

--yMultiplier <multiplier> Tex coord y mulitplier.

 

--zMultiplier <multiplier> Tex coord z mulitplier.

 

 

--xSize <size> Relative width of rendered brick.

 

--ySize <size> Relative length of rendered brick.

 

--zSize <size> Relative height of rendered brick.

 

 

____

 

Using in Present3D

 

You can load and view the resulting volume either by creating a P3D xml file with your volume and other data or just by using present3D on the command line, so type :

 

 

and this will load your volume. You can now use the the u, i and k keys along with mouse movement, to interact with the volume, try it :-)