WORK.md

Obj files

Vertex data

• geometric vertices (v)
• texture vertices (vt)
• vertex normals (vn)
• parameter space vertices (vp) Free-form curve/surface attributes

Curves and Surfaces

• rational or non-rational forms of curve or surface type: basis matrix, Bezier, B-spline, Cardinal, Taylor (cstype)
• degree (deg)
• basis matrix (bmat)
• step size (step)

Elements

• point (p)
• line (l)
• face (f)

Curves and Surface Elements

• curve (curv)
• 2D curve (curv2)
• surface (surf)

Free-form curve/surface body statements

• parameter values (parm)
• outer trimming loop (trim)
• inner trimming loop (hole)
• special curve (scrv)
• special point (sp)
• end statement (end)

Connectivity between free-form surfaces

• connect (con)

Grouping

• group name (g)
• smoothing group (s)
• merging group (mg)
• object name (o)

Display/render attributes

• bevel interpolation (bevel)
• color interpolation (c_interp)
• dissolve interpolation (d_interp)
• level of detail (lod)
• material name (usemtl)
• material library (mtllib)
• shadow casting (shadow_obj)
• ray tracing (trace_obj)
• curve approximation technique (ctech)
• surface approximation technique (stech)

mtl files

• new material name (newmtl)
• ambient (Ka)
• diffuse (Kd)
• specular (Ks)
• non-transparency (d)
• transparency (Tr)
• transmission filter (Tf)
• shininess (Ns)
• illumination model (illum)
• ambient map (map_Ka)
• diffuse map (map_Kd)
• specular map (map_Ks)
• shininess map (map_Ns)
• non-transparency map (map_d)
• texture anti-aliasing (map_aat)
• displacement map (disp)
• decal map (decal)
• bump map (bump)
• reflection map (refl)