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Elite on the BBC Micro

Drawing ships: SHIP_BOA [Elite-A, Ship blueprints K]

Name: SHIP_BOA [Show more] Type: Variable Category: Drawing ships Summary: Ship blueprint for a Boa Deep dive: Ship blueprints
Context: See this variable in context in the source code References: This variable is used as follows: * XX21 calls SHIP_BOA
.SHIP_BOA EQUB 5 \ Max. canisters on demise = 5 EQUW 70 * 70 \ Targetable area = 70 * 70 EQUB LO(SHIP_BOA_EDGES - SHIP_BOA) \ Edges data offset (low) EQUB LO(SHIP_BOA_FACES - SHIP_BOA) \ Faces data offset (low) EQUB 89 \ Max. edge count = (89 - 1) / 4 = 22 EQUB 0 \ Gun vertex = 0 EQUB 38 \ Explosion count = 8, as (4 * n) + 6 = 38 EQUB 78 \ Number of vertices = 78 / 6 = 13 EQUB 24 \ Number of edges = 24 \ --- Mod: Original Acornsoft code removed: -----------> \ EQUW 0 \ Bounty = 0 \ --- And replaced by: --------------------------------> EQUW 250 \ Bounty = 250 \ --- End of replacement ------------------------------> EQUB 52 \ Number of faces = 52 / 4 = 13 EQUB 40 \ Visibility distance = 40 \ --- Mod: Original Acornsoft code removed: -----------> \ EQUB 250 \ Max. energy = 250 \ --- And replaced by: --------------------------------> EQUB 164 \ Max. energy = 164 \ --- End of replacement ------------------------------> EQUB 24 \ Max. speed = 24 EQUB HI(SHIP_BOA_EDGES - SHIP_BOA) \ Edges data offset (high) EQUB HI(SHIP_BOA_FACES - SHIP_BOA) \ Faces data offset (high) EQUB 0 \ Normals are scaled by = 2^0 = 1 \ --- Mod: Original Acornsoft code removed: -----------> \ EQUB %00011100 \ Laser power = 3 \ \ Missiles = 4 \ --- And replaced by: --------------------------------> EQUB %00101010 \ Laser power = 5 \ Missiles = 2 \ --- End of replacement ------------------------------> \VERTEX x, y, z, face1, face2, face3, face4, visibility VERTEX 0, 0, 93, 15, 15, 15, 15, 31 \ Vertex 0 VERTEX 0, 40, -87, 2, 0, 3, 3, 24 \ Vertex 1 VERTEX 38, -25, -99, 1, 0, 4, 4, 24 \ Vertex 2 VERTEX -38, -25, -99, 2, 1, 5, 5, 24 \ Vertex 3 VERTEX -38, 40, -59, 3, 2, 9, 6, 31 \ Vertex 4 VERTEX 38, 40, -59, 3, 0, 11, 6, 31 \ Vertex 5 VERTEX 62, 0, -67, 4, 0, 11, 8, 31 \ Vertex 6 VERTEX 24, -65, -79, 4, 1, 10, 8, 31 \ Vertex 7 VERTEX -24, -65, -79, 5, 1, 10, 7, 31 \ Vertex 8 VERTEX -62, 0, -67, 5, 2, 9, 7, 31 \ Vertex 9 VERTEX 0, 7, -107, 2, 0, 10, 10, 22 \ Vertex 10 VERTEX 13, -9, -107, 1, 0, 10, 10, 22 \ Vertex 11 VERTEX -13, -9, -107, 2, 1, 12, 12, 22 \ Vertex 12 .SHIP_BOA_EDGES \EDGE vertex1, vertex2, face1, face2, visibility EDGE 0, 5, 11, 6, 31 \ Edge 0 EDGE 0, 7, 10, 8, 31 \ Edge 1 EDGE 0, 9, 9, 7, 31 \ Edge 2 EDGE 0, 4, 9, 6, 29 \ Edge 3 EDGE 0, 6, 11, 8, 29 \ Edge 4 EDGE 0, 8, 10, 7, 29 \ Edge 5 EDGE 4, 5, 6, 3, 31 \ Edge 6 EDGE 5, 6, 11, 0, 31 \ Edge 7 EDGE 6, 7, 8, 4, 31 \ Edge 8 EDGE 7, 8, 10, 1, 31 \ Edge 9 EDGE 8, 9, 7, 5, 31 \ Edge 10 EDGE 4, 9, 9, 2, 31 \ Edge 11 EDGE 1, 4, 3, 2, 24 \ Edge 12 EDGE 1, 5, 3, 0, 24 \ Edge 13 EDGE 3, 9, 5, 2, 24 \ Edge 14 EDGE 3, 8, 5, 1, 24 \ Edge 15 EDGE 2, 6, 4, 0, 24 \ Edge 16 EDGE 2, 7, 4, 1, 24 \ Edge 17 EDGE 1, 10, 2, 0, 22 \ Edge 18 EDGE 2, 11, 1, 0, 22 \ Edge 19 EDGE 3, 12, 2, 1, 22 \ Edge 20 EDGE 10, 11, 12, 0, 14 \ Edge 21 EDGE 11, 12, 12, 1, 14 \ Edge 22 EDGE 12, 10, 12, 2, 14 \ Edge 23 .SHIP_BOA_FACES \FACE normal_x, normal_y, normal_z, visibility FACE 43, 37, -60, 31 \ Face 0 FACE 0, -45, -89, 31 \ Face 1 FACE -43, 37, -60, 31 \ Face 2 FACE 0, 40, 0, 31 \ Face 3 FACE 62, -32, -20, 31 \ Face 4 FACE -62, -32, -20, 31 \ Face 5 FACE 0, 23, 6, 31 \ Face 6 FACE -23, -15, 9, 31 \ Face 7 FACE 23, -15, 9, 31 \ Face 8 FACE -26, 13, 10, 31 \ Face 9 FACE 0, -31, 12, 31 \ Face 10 FACE 26, 13, 10, 31 \ Face 11 FACE 0, 0, -107, 14 \ Face 12