Focal Stacks

OBJ Files

Requirements for OBJ files for CalVR to display:

• Material library file needs to be specified with extension, e.g.: mtllib coral-mtl.mtl.
• To use a texture image (image map) use the command usemtl, not usemap. Example: usemtl coral-material. This is for material file coral-mtl.mtl, which has the following content:

  newmtl coral-material
  map_Kd coral-map.jpg

• The image referenced by the material file in this example is coral-map.jpg.
• If the image is upside down, flip it with the following ImageMagick command:

  convert sourceimage.jpg -flip destimage.jpg

• Here's a script that converts data from Helicon Focus' obj format to CalVR's obj format:

#!/bin/bash
chmod 660 *
sed s/usemap/usemtl/ '$1' -i
sed s/map.jpg/coral-material/ '$1' -i
sed '/map_Kd/ i\newmtl coral-material' '$1'.mtl -i
convert '$1'.jpg -flip '$1'.jpg