Hands On DarkBASIC Pro - Digital Skills

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FIG-31.11 How a Plane is Positioned when First Created FIG-31.12 The MAKE OBJECT TRIANGLE Statement The MAKE OBJECT TRIANGLE Statement The additional spacing used within the instruction is used to highlight the various parameter groupings. The simplest of all polygons, the triangle, can be constructed using the MAKE OBJECT TRIANGLE statement. The statement requires the positions of all three vertices to be supplied, so this statement contains a significant number of values, as shown in FIG-31.12. MAKE OBJECT TRIANGLE objno , x1 In the diagram: The line , , , , , , x2 y2 z2 x3 y3 z3 objno is the integer value assigned to the triangle being created. x1,y1,z1 are real numbers representing the position of the first vertex. x2,y2,z2 are real numbers representing the position of the second vertex. x3,y3,z3 are real numbers representing the position of the third vertex. MAKE OBJECT TRIANGLE 7, 2,0,3, 5,0,3, 3.5,6,7 would create the triangle shown in FIG-31.13. DarkBASIC Pro: 3D Primitives 761 , y1 , z1
FIG-31.13 Creating a Triangle Object Positioning an Object FIG-31.14 The POSITION OBJECT Statement Notice that, unlike any of the other objects, a triangle can be placed anywhere in 3D space. Other than the triangle, every object is created with it’s centre at the point (0,0,0). However, once an object has been created, DarkBASIC Pro offers several ways of moving an object to another position. The POSITION OBJECT Statement One way to move an object is to use the POSITION OBJECT statement. The object is moved so that its centre is at the position specified. The statement has the format shown in FIG-31.14. In the diagram: y-axis objno is the integer value previously assigned to the object. x,y,z are real values representing the position to which the object is to be moved. It is the centre of the object that is placed at this position. For example, if we wanted the centre of the cube we had created previously to be moved to position (9,0,0), then we would use the statement: POSITION OBJECT 1,9,0,0 (2,0,3) (5,0,3) x-axis (3.5,6,7) , , , The result of executing this statement is shown in FIG-31.15. z-axis POSITION OBJECT objno x y z 762 DarkBASIC Pro: 3D Primitives
Page 1 and 2: Hands On DarkBASIC Pro A Self-Study
Page 3 and 4: Copyright © Alistair Stewart 2006
Page 5 and 6: The TURN OBJECT Statement . . . . .
Page 7 and 8: The YROTATE CAMERA Statement . . .
Page 9 and 10: Chapter 35 Meshes and Limbs Meshes.
Page 11 and 12: The OBJECT IN SCREEN Statement . .
Page 13 and 14: The MAKE OBJECT COLLISION BOX State
Page 15 and 16: Adding MoveElevator() . . . . . . .
Page 17 and 18: The RANDOMIZE MATRIX Statement . .
Page 19 and 20: The MAKE MEMBLOCK FROM SOUND Statem
Page 21 and 22: The TRANSPOSE MATRIX4 Statement . .
Page 23 and 24: Networking the Game . . . . . . . .
Page 25 and 26: Acknowledgements I would like to th
Page 27 and 28: Syntax Diagrams make only a half-he
Page 29 and 30: The 3D World Introduction The Coord
Page 31 and 32: FIG-30.4 Points Determining the Pos
Page 33 and 34: FIG-30.6 Rotation A Cuboid is Rotat
Page 35 and 36: FIG-30.13 Varying the Polygons in a
Page 37 and 38: FIG-30.17 Lights Surface Normals FI
Page 39 and 40: � Space within the 3D world is me
Page 41 and 42: 3D Primitives Introduction FIG-31.1
Page 43 and 44: FIG-31.5 The MAKE OBJECT BOX Statem
Page 45: FIG-31.9 The MAKE OBJECT CONE State
Page 49 and 50: FIG-31.16 The MOVE OBJECT Statement
Page 51 and 52: FIG-31.19 Possible Rotations about
Page 53 and 54: LISTING-31.3 Rotating an Object abo
Page 55 and 56: FIG-31.29 The PITCH OBJECT Statemen
Page 57 and 58: FIG-31.32 The POINT OBJECT Statemen
Page 59 and 60: LISTING-31.6 (continued) Local Axes
Page 61 and 62: LISTING-31.7 Resizing an Object REM
Page 63 and 64: Copying a 3D Object FIG-31.43 The C
Page 65 and 66: FIG-31.46 FIG-31.47 The OBJECT POSI
Page 67 and 68: FIG-31.49 The OBJECT ANGLE Statemen
Page 69 and 70: LISTING-31.11 (continued) Switching
Page 71 and 72: FIG-31.53 The SET GLOBAL OBJECT CRE
Page 73 and 74: Merging Primitives Introduction FIG
Page 75 and 76: FIG-31.58 As you've just discovered
Page 77 and 78: Solutions Activity 31.1 No solution
Page 79 and 80: Activity 31.20 The duplicated cube
Page 81 and 82: 796 DarkBASIC Pro: 3D Primitives
Page 83 and 84: Adding Texture Introduction FIG-32.
Page 85 and 86: FIG-32.3 An Image with Added Mipmap
Page 87 and 88: FIG-32.5 Floor Texturing FIG-32.6 T
Page 89 and 90: Seamless Tiling FIG-32.10 A Visible
Page 91 and 92: FIG-32.12 The PLAY ANIMATION TO IMA
Page 93 and 94: LISTING-32.6 (continued) Using the
Page 95 and 96: The SET OBJECT TRANSPARENCY Stateme
Page 97 and 98:
LISTING-32.9 Using a Secondary Text
Page 99 and 100:
LISTING-32.10 (continued) Using the
Page 101 and 102:
FIG-32.24 A Transparent Cube Activi
Page 103 and 104:
FIG-32.27 The FADE OBJECT Statement
Page 105 and 106:
Images with an Alpha Channel Introd
Page 107 and 108:
Creating a Complex 3D Shape Introdu
Page 109 and 110:
The Code LISTING-32.15 Drawing the
Page 111 and 112:
LISTING-32.15 (continued) Drawing t
Page 113 and 114:
Sky Spheres FIG-32.32 Using a Sky S
Page 115 and 116:
Summary To cure the problem of an i
Page 117 and 118:
REM *** Create and texture plain ob
Page 119:
TEXTURE OBJECT GroundObj,CobbleImg
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Hands On DarkBASIC Pro - Digital Skills

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