SilverScreenAPI

SS_TRIANGLE_INFO

Structure

A data type that stores information retrieved from the triangulation routines about a single triangle.

struct SS_TRIANGLE_INFO

{

SS_XYZ points[3];

SS_XYZ normals[3];

SS_XYZ texture_coord[3];

VERTEX vertices[3];

int winding_order_index[3];

BOOLEAN is_original_edge[3];

RGB edge_rgb[3];

USINT32 edge_type[3];

};

Members

Member	Description
points	An array of 3D points that make up a triangle. The triangle is formed by the lines points[0] to points[1], points[1] to points[2], and points[2] to points[0].
normals	Three vertex normals associated with the three points in 'points' that are boundary-averaged if appropriate.
texture_coord	The 2D texture coordinates corresponding to 'points'.
vertices	Either 0, or a vertex number associated with each point. The vertex number references the vertex table of the parent OBJECT_NODE of the primitive being triangulated.
winding_order_index	This is a primitive-local index corresponding to each 3D point. It is provided as a convenience, but is not tied to the OBJECT_NODE vertex tables (the way 'vertices' is).
is_original_edge	If is_original_edge[0] is TRUE, then the points from points[0] to points[1] form a line that belongs to the primitive being triangulated. If it is FALSE, then the lined formed from points[0] to points[1] was introduced by the triangulator. is_original_edge[1] applies to the line formed from points[1] to points[2], and is_original_edge[2] applies to the line formed from points[2] to points[0].
edge_rgb	edge_rgb[0] is an edge color for the line formed between points[0] and points[1]. edge_rgb[1] applies to the line formed from points[1] to points[2], and edge_rgb[2] applies to the line formed from points[2] to points[0].
edge_type	edge_type[0] is a line width and style index for the line formed between points[0] and points[1]. edge_type[1] applies to the line formed from points[1] to points[2], and edge_type[2] applies to the line formed from points[2] to points[0].

Remarks

points[0] corresponds with normals[0], texture_coord[0], vertices[0], and so on. points[1] corresponds with normlas[1], texture_coord[1], vertices[1] and so on.

A vertex number might be 0 if a polygon being triangulated contains an arc. In this case, the facets which are generated to approximate the arc do not have vertex numbers (except at the end-points).