Hands On DarkBASIC Pro - Digital Skills

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� Use MOVE OBJECT to move an object along the x or y axis. � Every 3D object has its own local axes with the origin at the centre of the object. � Use the XROTATE, YROTATE or ZROTATE OBJECT statements to rotate an object to a specific angle about one of its local axes. � Use ROTATE OBJECT to rotate an object to specific angles about all three local axes at the same time. � Use PITCH, TURN or ROLL OBJECT statements to rotate an object by a number of degrees around a given axis. � Use POINT OBJECT to make an object face towards a specified point. � Use MOVE OBJECT distance to move the object a specified number of units in the direction in which an object is pointing. � Use FIX OBJECT PIVOT to reset an object's local axes to be in line with the global axes. � Use SCALE OBJECT to change the dimensions of an object. � Use HIDE OBJECT to make an object invisible. � Use SHOW OBJECT to make an invisible object reappear. � Use DELETE OBJECT to erase an object from RAM. � Use DELETE OBJECTS to erase a group og objects from RAM. � Use CLONE OBJECT to make an independent copy of an existing object. � Use INSTANCE OBJECT to create a dependent copy of an existing object. � Use OBJECT EXIST to check if a specified object exists. � Use OBJECT VISIBLE to check if a specified object is visible. � Use OBJECT POSITION to determine the position in space of an object's centre. � Use OBJECT SIZE to determine the dimensions of a specified object. � Use OBJECT ANGLE to determine the current angle of rotation a specified object has about its local axes. � Use SET OBJECT WIREFRAME to display a 3D object in wireframe or normal mode. � Use SET OBJECT CULL to toggle culling for a specified 3D object. � Use SET GLOBAL OBJECT CREATION to enable/disable vertex buffer sharing. DarkBASIC Pro: 3D Primitives 787
Merging Primitives Introduction FIG-31.54 Shape Union FIG-31.55 Shape Difference FIG-31.56 Shape Intersection The Statements DarkBASIC Pro version 1.058 introduced statements which allow us to create new shapes by merging two primitives. There are three basic options available: Create the new shape from the combination of the two original shapes - known as union (see FIG-31.54). Shape 1 Shape 2 Resulting Shape Create the new shape by removing the overlapping section of shape 2 from shape 1 - known as difference (see FIG-31.55). Create the new shape from the overlapping area between shape 1 and shape 2 - known as intersection (see FIG-56). When we join two shapes using the merge statements, the resulting shape is stored in a format knows as Constructive Solid Geometry (CSG). We need not concern ourselves with the details of this format, and it is only mentioned here so that you know the meaning of the initials used in the statements. The PERFORM CSG UNION Statement union difference Shape 1 Shape 2 Resulting Shape intersection Shape 1 Shape 2 Resulting Shape We can create a new shape from the union of two existing shapes using the PERFORM CSG UNION statement which has the format shown in FIG-31.57. 788 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 and 46: FIG-31.9 The MAKE OBJECT CONE State
Page 47 and 48: FIG-31.13 Creating a Triangle Objec
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: FIG-31.53 The SET GLOBAL OBJECT CRE
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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