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The following constraints are applied to meshes created using PathEngine's base mesh format.
The coordinates for vertices of the mesh must be within the range supported by PathEngine.
(See
The mesh must consist of one or more triangular faces.
Each face must have nonzero area.
The vertices for each face must run clockwise as seen from above.
(Put another way, each vertex must lie on the right of the line formed by the previous two, as seen from above.)
Face vertices

Comments


x=20, y=30, z=10 x=20, y=50, z=10 x=20, y=40, z=10 
Invalid  zero area 
x=20, y=30, z=10 x=20, y=50, z=20 x=20, y=40, z=10 
Invalid  nonzero area, but does not face upwards 
x=20, y=30, z=10 x=10, y=50, z=10 x=20, y=40, z=10 
Invalid  faces downwards 
x=20000, y=30, z=10 x=20010, y=50, z=10 x=20000, y=40, z=10 
Invalid  x coordinate outside valid range (for evaluation version) 
The connectivity between faces is specified explicitly.
An edge may be external (no connection) or else may connect to another face.
Multiple connections cannot be made to a single edge.
The vertices each side of a connection must be identical.
The following mesh is invalid because the vertex indices for the edges being connected do not match:
<mesh> <mesh3D> <verts> <vert x="4" y="7"/> <vert x="10" y="11"/> <vert x="11" y="1"/> <vert x="11" y="11"/> <vert x="19" y="2"/> </verts> <tris> <tri edge0StartVert="0" edge1StartVert="1" edge2StartVert="2"/> <tri edge0StartVert="2" edge1StartVert="3" edge2StartVert="4" edge0Connection="0"/> </tris> </mesh3D> </mesh> 
Vertices do not match across a connection
Unconnected vertices are no longer permitted. All vertices must be assigned to at least one edge.
Each vertex must be connected to exactly one set on connected tris. It should be possible to reach all edges that are assigned to a given vertex by folling edge connections around that vertex.
Documentation for PathEngine release 6.03  Copyright © 20022021 PathEngine  next: 