The SHIP_VIPER (Ship blueprints K) variable - Elite on the BBC Micro and NES

       Name: SHIP_VIPER                                              [Show more]
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for a Viper
  Deep dive: Ship blueprints
    Context: See this variable in context in the source code
 Variations: See code variations for this variable in the different versions
 References: This variable is used as follows:
             * XX21 uses SHIP_VIPER


.SHIP_VIPER

 EQUB 0                 \ Max. canisters on demise = 0
 EQUW 75 * 75           \ Targetable area          = 75 * 75

 EQUB LO(SHIP_VIPER_EDGES - SHIP_VIPER)            \ Edges data offset (low)
 EQUB LO(SHIP_VIPER_FACES - SHIP_VIPER)            \ Faces data offset (low)

 EQUB 77                \ Max. edge count          = (77 - 1) / 4 = 19
 EQUB 0                 \ Gun vertex               = 0
 EQUB 42                \ Explosion count          = 9, as (4 * n) + 6 = 42
 EQUB 90                \ Number of vertices       = 90 / 6 = 15
 EQUB 20                \ Number of edges          = 20
 EQUW 0                 \ Bounty                   = 0
 EQUB 28                \ Number of faces          = 28 / 4 = 7
 EQUB 23                \ Visibility distance      = 23
 EQUB 100               \ Max. energy              = 100
 EQUB 32                \ Max. speed               = 32

 EQUB HI(SHIP_VIPER_EDGES - SHIP_VIPER)            \ Edges data offset (high)
 EQUB HI(SHIP_VIPER_FACES - SHIP_VIPER)            \ Faces data offset (high)

 EQUB 1                 \ Normals are scaled by    = 2^1 = 2
 EQUB %00010001         \ Laser power              = 2
                        \ Missiles                 = 1

.SHIP_VIPER_VERTICES

      \    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX    0,    0,   72,     1,      2,    3,     4,         31    \ Vertex 0
 VERTEX    0,   16,   24,     0,      1,    2,     2,         30    \ Vertex 1
 VERTEX    0,  -16,   24,     3,      4,    5,     5,         30    \ Vertex 2
 VERTEX   48,    0,  -24,     2,      4,    6,     6,         31    \ Vertex 3
 VERTEX  -48,    0,  -24,     1,      3,    6,     6,         31    \ Vertex 4
 VERTEX   24,  -16,  -24,     4,      5,    6,     6,         30    \ Vertex 5
 VERTEX  -24,  -16,  -24,     5,      3,    6,     6,         30    \ Vertex 6
 VERTEX   24,   16,  -24,     0,      2,    6,     6,         31    \ Vertex 7
 VERTEX  -24,   16,  -24,     0,      1,    6,     6,         31    \ Vertex 8
 VERTEX  -32,    0,  -24,     6,      6,    6,     6,         19    \ Vertex 9
 VERTEX   32,    0,  -24,     6,      6,    6,     6,         19    \ Vertex 10
 VERTEX    8,    8,  -24,     6,      6,    6,     6,         19    \ Vertex 11
 VERTEX   -8,    8,  -24,     6,      6,    6,     6,         19    \ Vertex 12
 VERTEX   -8,   -8,  -24,     6,      6,    6,     6,         18    \ Vertex 13
 VERTEX    8,   -8,  -24,     6,      6,    6,     6,         18    \ Vertex 14

.SHIP_VIPER_EDGES

    \ vertex1, vertex2, face1, face2, visibility
 EDGE       0,       3,     2,     4,         31    \ Edge 0
 EDGE       0,       1,     1,     2,         30    \ Edge 1
 EDGE       0,       2,     3,     4,         30    \ Edge 2
 EDGE       0,       4,     1,     3,         31    \ Edge 3
 EDGE       1,       7,     0,     2,         30    \ Edge 4
 EDGE       1,       8,     0,     1,         30    \ Edge 5
 EDGE       2,       5,     4,     5,         30    \ Edge 6
 EDGE       2,       6,     3,     5,         30    \ Edge 7
 EDGE       7,       8,     0,     6,         31    \ Edge 8
 EDGE       5,       6,     5,     6,         30    \ Edge 9
 EDGE       4,       8,     1,     6,         31    \ Edge 10
 EDGE       4,       6,     3,     6,         30    \ Edge 11
 EDGE       3,       7,     2,     6,         31    \ Edge 12
 EDGE       3,       5,     6,     4,         30    \ Edge 13
 EDGE       9,      12,     6,     6,         19    \ Edge 14
 EDGE       9,      13,     6,     6,         18    \ Edge 15
 EDGE      10,      11,     6,     6,         19    \ Edge 16
 EDGE      10,      14,     6,     6,         18    \ Edge 17
 EDGE      11,      14,     6,     6,         16    \ Edge 18
 EDGE      12,      13,     6,     6,         16    \ Edge 19

.SHIP_VIPER_FACES

    \ normal_x, normal_y, normal_z, visibility
 FACE        0,       32,        0,         31    \ Face 0
 FACE      -22,       33,       11,         31    \ Face 1
 FACE       22,       33,       11,         31    \ Face 2
 FACE      -22,      -33,       11,         31    \ Face 3
 FACE       22,      -33,       11,         31    \ Face 4
 FACE        0,      -32,        0,         31    \ Face 5
 FACE        0,        0,      -48,         31    \ Face 6

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Macro EDGE (category: Drawing ships)

Macro definition for adding edges to ship blueprints

[X]

Macro FACE (category: Drawing ships)

Macro definition for adding faces to ship blueprints

[X]

Variable SHIP_VIPER (category: Drawing ships)

Ship blueprint for a Viper

[X]

Label SHIP_VIPER_EDGES is local to this routine

[X]

Label SHIP_VIPER_FACES is local to this routine

[X]

Macro VERTEX (category: Drawing ships)

Macro definition for adding vertices to ship blueprints

Drawing ships: SHIP_VIPER

[BBC Micro disc version, Ship blueprints K]