Hands On DarkBASIC Pro - Digital Skills

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FIG-31.31 In the diagram: LEFT, RIGHT Choose RIGHT to make the object rotate to the right about the y-axis; choose LEFT to make the object rotate to the left. objno is an integer value giving the ID of the object to be rotated. angle is a real number giving the angle (in degrees) to which the object is to be rotated relative to its current position. The angle can be a positive or negative value. Activity 31.11 Modify your previous program so that the cube rotates to the right about the y-axis. The ROLL OBJECT Statement Relative rotation about the z-axis is achieved using the ROLL OBJECT statement which has the format shown in FIG-31.31. The ROLL OBJECT LEFT Statement ROLL OBJECT objno In the diagram: LEFT, RIGHT Choose RIGHT to make the object rotate to the right about the z-axis; choose LEFT to make the object rotate to the left. objno is an integer value giving the ID of the object to be rotated. angle is a real number giving the angle (in degrees) to which the object is to be rotated relative to its current position. The angle can be a positive or negative value. Activity 31.12 Modify your previous program so that the cube rotates to the left about the z-axis. The POINT OBJECT Statement {{ RIGHT RIGHT , angle The main polygon of a 3D object is directed towards the player's viewpoint when it is created. This polygon can be rotated to face any point in space using the POINT OBJECT statement. This statement has the format shown in FIG-31.32. DarkBASIC Pro: 3D Primitives 771
FIG-31.32 The POINT OBJECT Statement LISTING-31.5 Using the POINT OBJECT Statement FIG-31.33 Turning an Object to Face a Specified Point In the diagram: objno is an integer value giving the ID of the object to be affected. x,y,z are the coordinates of the point in space at which the main polygon of the 3D object is to face. In the program shown in LISTING-31.5 a cube is made to face the point (45,45,0) using the statement: POINT OBJECT 1,45,45,0 REM *** Set display resolution and backdrop *** SET DISPLAY MODE 1280,1024,32 COLOR BACKDROP 0 BACKDROP ON REM *** Make the set of objects *** MAKE OBJECT CUBE 1,40 REM *** Move cube to (0,0,100) after key press *** WAIT KEY POSITION OBJECT 1,0,0,100 REM *** point cube at (45,45,0)*** WAIT KEY POINT OBJECT 1,45,45,0 REM *** End program *** WAIT KEY END The result is shown in FIG-31.33. Initially, the cube’s main polygon faces the viewer. Activity 31.13 POINT OBJECT objno x y z Type in and test the program given in LISTING-31.5 (object3D07.dbpro). Modify the program to make the cube face the point (-20,17,-10). The MOVE OBJECT distance Statement , , , After the POINT OBJECT statement is executed, the main polygon faces (45,45,0). We've already encountered a MOVE OBJECT statement which allows an object to be moved up, down, left, or right, but a second version of MOVE OBJECT exists which will move an object in the direction its main polygon is facing. This statement has the format shown in FIG-31.34. 772 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: FIG-31.29 The PITCH 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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