Draw Textured Polytriangle

Purpose

The Draw Textured Polytriangle function draws a connected chain of texture mapped triangles.

Syntax

Arguments TBD

Details

Topologically, a polytriangle is a strip of connected triangles, where each successive triangle in the chain is defined by a single vertex and two vertices from the previous triangle in the strip as shown in figure 1.

A polytriangle is similar to a polygon, but the vertices are specified in a special order that allows for well-defined smooth shading of the triangle interiors.

When the "Fill Mode" attribute is inactive (the default) the edges of the triangles are rendered as texture mapped lines in accordance with the current "Line Weight," "Line Cap," "Line Pattern," and "Visibility" attributes.

When the "Fill Mode" attribute is active, each triangle is rendered by interpolating the texture coordinates from each vertex across the interior of the triangle, and then selecting colors from a texture map image based on the interpolated coordinates.

(TBD - WORK-IN-PROGRESS)

Notes

If a textured polytriangle with more than 65,791 triangles is desired, it must be drawn by multiple Draw Textured Polytriangle opcodes.

Implementation in WHIP! Versions

See Also

Set Line Weight, Set Line Cap, Set Line Pattern, Set Visibility, Draw Line, and Set Fill Mode