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BBC Micro Elite

Drawing ships: EDGE

Name: EDGE [View in context] Type: Macro Category: Drawing ships Summary: Macro definition for adding edges to ship blueprints Deep dive: Ship blueprints
The following macro is used to build the ship blueprints: EDGE vertex1, vertex2, face1, face2, visibility See the deep dive on "Ship blueprints" for details of how edges are stored in the ship blueprints, and the deep dive on "Drawing ships" for information on how edges are used to draw 3D wiremesh ships. Arguments: vertex1 The number of the vertex at the start of the edge vertex1 The number of the vertex at the end of the edge face1 The number of face 1 associated with this edge face2 The number of face 2 associated with this edge visibility The visibility distance, beyond which the edge is not shown
MACRO EDGE vertex1, vertex2, face1, face2, visibility f = face1 + (face2 << 4) EQUB visibility, f, vertex1 << 2, vertex2 << 2 ENDMACRO