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- .so psroff.inc # Include the macros needed for output to Postscript
- .TH Export-3D-Studio
- .SH NAME
- exp_3ds \- 3D Studio geometry export filter
- .SH SYNOPSIS
- .PP
- This man page describes the options specific to the 3D Studio
- geometry export converter.
- .PP
- .SH EXAMPLE CONVERSION SYNTAX
- .PP
- To convert a Wavefront file to 3D Studio using the default parameters listed
- in the setup.ini file:
- .IP
- pt -i wave -o 3ds filename.obj
- .PP
- .SH OVERVIEW
- .PP
- The 3D Studio geometry export converter writes out the entire scene database
- as smoothed triangle meshes along with their associated material definitions
- as well as all lights and cameras that are defined in the converter's
- database.
- .PP
- This converter outputs almost every possible 3D Studio file attribute.
- For materials, a partial list includes all texture maps (texture # 1, texture # 2,
- reflect map, bump map, shininess map and opacity map), automatic planar & cubical
- environment maps, transparency values, phong values and shading modes (flat
- to metal). Note: the converter also does shading parameter matching so that, for
- example, colors and textures read in from Lightwave will be rendered fairly
- closely when exported to 3D Studio. Other exported attributes include view
- port settings, atmospheric effects and background color schemes.
- .PP
- All polygons will be converted into triangles, including concave polygons and
- polygons with holes. Once converted, an algorithm will be invoked which
- assigns unique smoothing group numbers to the triangle meshes so that
- the destination program can reconstruct the vertex normals (.3ds files
- have no vertex normal information in them).
- .PP
- Texture coordinates will also be output along with the triangular meshes if
- texture data exists.
- .PP
- If an object has more than 65535 polygons, vertices or texture coordinates
- then a complex algorithm will be invoked to split the object apart into
- multiple pieces, each with less than 65535 polygons, vertices and texture
- coordinates. Each object will share the same name but have a different
- number appended to the end of the name. Please take note that the new sub-objects
- created will not share the same smoothing group (due to a 3D Studio limitation),
- and thus smoothing will not occur between the new sub-objects within 3D
- Studio. For example, if a sphere which consists of 120000 polygons is exported
- to a 3D Studio file then the sphere will be broken up into 2 sub-objects;
- the seam between the two sub-objects will not appear to be smooth when
- rendered within 3D Studio because of this smoothing limitation.
- .PP
- .SH LIMITATIONS
- .PP
- Object names in a 3D Studio file are limited to 10 characters and material
- names are limited to 16 characters. If any exported name is found to be
- longer than these limits then the converter will truncate the name and
- make it unique by appending a number to last character in the name.
- .PP
- 3D Studio has a limit of 65535 polygons, vertices or texture coordinates
- per object. Objects broken up into multiple sub-objects may have not
- appear to be smooth where the sub-objects intersect.
- .PP
- .SH COMMAND LINE OPTIONS
- .PP
- The following options are specific to this export converter:
- .TP
- -o 3ds
- This is the mandatory command line option which specifies that the data
- is to be exported using the 3D Studio format converter.