Hands On DarkBASIC Pro - Digital Skills

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LISTING-31.8 Hiding and Showing Objects FIG-31.41 The program in LISTING-31.8 rotates a cube continually, hiding the cube when ‘h’ is pressed and showing it again when ‘s’ is pressed. REM *** Set display resolution *** SET DISPLAY MODE 1280,1024,32 REM *** Make and position cube *** MAKE OBJECT CUBE 1, 20 POSITION OBJECT 1, 0,0,200 REM *** Rotate object *** DO PITCH OBJECT UP 1, 1.0 REM *** Read key *** ch$ = INKEY$() REM *** IF its s - show cube *** IF ch$ = “s” SHOW OBJECT 1 ENDIF REM *** IF its h - hide cube *** IF ch$ = “h” HIDE OBJECT 1 ENDIF LOOP REM *** End program *** END Activity 31.18 Type in and test the program given above (object3D10.dbpro). The DELETE OBJECT Statement The DELETE OBJECT Statement FIG-31.42 The DELETE OBJECTS Statement When a 3D object is no longer required, its RAM space can be released using the DELETE OBJECT statement which has the format shown in FIG-31.41. In the diagram: objno is an integer value specifying the ID of the 3D object to be deleted. The DELETE OBJECTS Statement If we need to delete several objects at one time, then the most efficient way to do this is to use the DELETE OBJECTS statement which has the format shown in FIG-31.42. In the diagram: DELETE OBJECT objno DELETE OBJECTS objno1 , objno2 objno1 is an integer value specifying the lowest ID of the 3D objects to be deleted. objno2 is an integer value specifying the highest ID of the 3D objects to be deleted. DarkBASIC Pro: 3D Primitives 777
Copying a 3D Object FIG-31.43 The CLONE OBJECT Statement LISTING-31.9 Creating a Copy of a 3D Object For example, if we needed to delete 10 3D objects with ID values ranging from 8 to 17, then we would use the statement: DELETE OBJECTS 8,17 We can create a copy of an existing 3D object in one of two ways, as described below. The CLONE OBJECT Statement The CLONE OBJECT statement creates an independent copy of an existing 3D object. The statement has the format shown in FIG-31.43. In the diagram: objno1 is an integer value specifying the ID to be assigned to the object being created. objno2 is an integer value specifying the ID of the existing object to be copied. The program in LISTING-31.9 uses the CLONE OBJECT statement to create a duplicate cube. REM *** Set display resolution *** SET DISPLAY MODE 1280,1024,32 REM *** Make and position cube *** MAKE OBJECT CUBE 1,40 POSITION OBJECT 1,-40,0,100 REM *** Rotate cube *** WAIT KEY XROTATE OBJECT 1 , -45 REM *** Copy cube *** WAIT KEY CLONE OBJECT 2,1 REM *** Position copy *** POSITION OBJECT 2, 40,0,50 REM *** Delete original cube *** WAIT KEY DELETE OBJECT 1 REM *** End program *** WAIT KEY END Activity 31.19 CLONE OBJECT objno1 , objno2 Type in and test the program given in LISTING-31.9 (object3D11.dbpro). Is the copied cube rotated to the same angle as the original? Is the copied cube deleted when the original cube is removed? 778 DarkBASIC Pro: 3D Primitives
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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: LISTING-31.7 Resizing an Object REM
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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