This is a read-only mirror of pymolwiki.org
Difference between revisions of "Collada geometry mode"
Jaredsampson (talk | contribs) (Created) |
m (1 revision) |
(No difference)
|
Latest revision as of 21:08, 9 July 2015
Collada geometry mode controls the types of geometry
elements used in COLLADA output. Different modes can be useful depending on how the output file will be used, as different graphics viewing and editing applications have varying levels of support for the various features of the COLLADA specification.
Values
Currently there are 2 modes implemented for COLLADA geometry export.
- 0: (default) Use any valid COLLADA 1.4.1 elements, including
triangles
,trifans
,tristrips
andpolylist
, etc. This is the recommended mode for most applications, including Apple's Preview and iBooks/iBooks Author. - 1: Blender-compatible mode. Use only
polylist
elements. This generally results in a larger file size, aspolylist
elements require explicit data for things like the number of vertices in each polygon (<vcount>
), whereas the more specific elements liketriangles
do not (by definition, each triangle has 3 vertices).
Syntax
set collada_geometry_mode, 0 # Valid COLLADA 1.4.1 (default)
set collada_geometry_mode, 1 # Blender-compatible mode
Example
The following script creates two output files containing a single cylinder, one with the default collada_geometry_mode set to 0 (cgm0.dae) and the other set to 1 (cgm1.dae).
reinitialize
pseudoatom ps1, pos=[-0.5,0,0]
pseudoatom ps2, pos=[0.5,0,0]
hide nonbonded
distance d, ps1, ps2
set dash_round_ends, 0
set dash_gap, 0
hide labels, d
save cgm0.dae
set collada_geometry_mode, 1
save cgm1.dae
Running diff cgm0.dae cgm1.dae
on the two output files results in the following output, indicating that for collada_geometry_mode=1, polylist
elements were used to create the ends of the cylinder, rather than triangle
elements.
70c70
< <triangles count="8" material="geom0-material">
---
> <polylist count="8" material="geom0-material">
73a74
> <vcount>3 3 3 3 3 3 3 3 </vcount>
75,76c76,77
< </triangles>
< <triangles count="8" material="geom0-material">
---
> </polylist>
> <polylist count="8" material="geom0-material">
79a81
> <vcount>3 3 3 3 3 3 3 3 </vcount>
81c83
< </triangles>
---
> </polylist>