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This viewer reads, triangulates and displays 3D geometry from OBJ WaveFront files. OBJ is a text format for describing 3D models, it is supported as export from most widely-used 3D CAD studios like ScketchUp, 3DS Studio Max, DAZ Studio, SOFTIMAGE and many others.

The program uses its own triangulation engine for reducing the faces to triangles. For closed surfaces it also calculate normals, if they are not ordered correctly, calculates volumes and surfaces. It also supports materials and textures readed from MTL files.

The demo viewer is suitable for small and medium sized objects, comprised from up to one hundred thousand triangles. On the right, the viewer shows a tree with the object hierarchy and the separate meshes, they can be viewed with checking/unchecking the checkboxes next to them. Some geometry paramaters of the meshes are given in the data nodes of the tree. For drawings is used OpenGL.

Main characteristics of the viewer:
Support of the OBJ Wavefront:
g defines object group
v defines a (x,y,z) point
f defines a v/vt/vn face
vt defines (u,v) texture coordinate
vn defines normal (vx,vy,vz) vector (not used!)
mtllib defines the library file with materials (.MTL)
newmtl defines new material
usemtl defines the current material
Ka defines ambient material color (rgb)
Kd defines diffuse material color (rgb)
Ks defines specular material color (rgb)
map_Kd defines texture image (bmp,jpg,png)
Face Triangulation
Create trianglular mesh
Reduce all planar and simple polygon faces to triangles
Calculate normals
Reorder normals to point outside (for closed surfaces)
Calculate volumes and surfaces of closed surfaces
Keep texture coordinates
Translation and Scale of the model
Display
Display object hierarchy
Draws triangles, textures, face and triangles edges
Draw Normals
Support Lights
The viewer is tested with import of OBJ files exported from SketchUp, DAZ Studio, Autodesk Maya and SOFTIMAGE.