Quadrangulate Op Property Editor

Dissolves pairs of adjacent triangles to form quadrilateral polygons, according to rule-based criteria. This is useful for cleaning up imported quad objects that were converted to triangles. It can also be useful as a first step when turning any arbitrary triangle mesh into quads, although the modified mesh may still contain some triangles.

To apply: Select one or more polygon mesh objects, polygon clusters, or polygons, then choose Modify Poly. Mesh Quadrangulate from the Model toolbar.

To redisplay: Select the polygon mesh object, click the Selection button on the Select panel, then click the Quadrangulate Op icon.

Nb Polygons	The total number of polygons in the modified mesh object. This value is displayed for information only.
Incidence Angle	The maximum difference between the normals of two adjacent triangles for them to be considered as candidates for dissolving. For example, if this value is 30, then only adjacent triangles with dihedral angles between 30 and -30 degrees are considered. As you increase this value, you start to lose more sharp details.

Aspect

Defines several additional tests for eliminating pairs of triangles from consideration.

Projection Plane	Specifies the projection plane used for the tests. For example, you can specify the XZ plane for terrain. Don't Project: The tests are applied relative to the triangles' own normals. XoY Plane: The object's XY plane. YoZ Plane: The object's YZ plane. XoZ Plane: The object's XZ plane.
Test Corner Angle	Tests the corners of the resulting quad. If they differ from 90 degrees by more than Max Corner Right Angle Deviation, the pair of triangles is eliminated as a candidate for dissolving.
Max Corner Right Angle Deviation	Specifies the maximum deviation from right angles when Test Corner Angle is on. Decreasing this value results in more rectangular quads but more leftover triangles.
Test Quad Alignment	Tests the alignment of the quad's edges with the edges of its neighboring polygons. If the angle between edges differs from a straight line by more than Max Alignment Angle, the pair of triangles is eliminated as a candidate for dissolving.
Max Corner Right Angle Deviation	Specifies the maximum deviation of the quad's edge loops from a straight line when Test Quad Alignment is on. Decreasing this value results in better aligned quads but more leftover triangles.

Attributes Preservation

Preserve Hard Edge	Prevents the removal of edges that have been marked as hard.
Preserve Property Seams	Prevents the removal of edges that represent discontinuities in attributes such as materials, texture UVs, and so on.