Hands On DarkBASIC Pro - Digital Skills

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FIG-31.22 The YROTATE OBJECT Statement The YROTATE OBJECT Statement FIG-31.23 The Effect of the YROTATE OBJECT Statement FIG-31.24 To rotate an object about its local y-axis we use the YROTATE OBJECT statement which has the format shown in FIG-31.22. In the diagram: objno is the integer value previously assigned to the object. angle is a real number giving the angle (in degrees) to which the object is to be rotated. For example, a cube (ID 1) could be rotated about its y-axis to 60 o using the line: YROTATE OBJECT 1, 60.0 FIG-31.23 shows the cube after a rotation to 60 o . The ZROTATE OBJECT Statement The ZROTATE OBJECT Statement FIG-31.25 The Effect of the ZROTATE OBJECT Statement To rotate an object about its z-axis, we use the ZROTATE OBJECT statement which has the format shown in FIG-31.24. In the diagram: YROTATE OBJECT objno , angle ZROTATE OBJECT objno , angle objno is the integer value previously assigned to the object. angle is a real number giving the angle (in degrees) to which the object is to be rotated. For example, a cube (ID 1) could be rotated about the z-axis to 110 o using the line: ZROTATE OBJECT 1, 110.0 FIG-31.25 shows the cube after a rotation to 110 o . DarkBASIC Pro: 3D Primitives 767
LISTING-31.3 Rotating an Object about all Three Axes FIG-31.26 The ROTATE OBJECT Statement The program in LISTING-31.3 revolves a cube about all three axes at the same time. REM ** Set display mode *** SET DISPLAY MODE 1280,1024,32 REM *** Create and position cube *** MAKE OBJECT CUBE 1, 40 POSITION OBJECT 1, 0, 0, 200 REM *** Rotate cube 1 degree at a time *** REM *** around all three axes *** FOR angle = 1 TO 360 XROTATE OBJECT 1, angle YROTATE OBJECT 1, angle ZROTATE OBJECT 1, angle WAIT 10 NEXT angle REM *** End program *** WAIT KEY END Activity 31.8 Type in and test the program given above (object3D05.dbpro). The ROTATE OBJECT Statement Rather than use three separate statements to rotate an object about all three axes, the same effect can be achieved using the ROTATE OBJECT statement. This statement takes three values specifying, for each axis, the degree of rotation. The format of the statement is shown in FIG-31.26. ROTATE OBJECT objno , xangle , yangle , zangle In the diagram: objno is the integer value previously assigned to the object. xangle is a real number giving the angle (in degrees) to which the object is to be rotated about its x-axis. yangle is a real number giving the angle (in degrees) to which the object is to be rotated about its y-axis. zangle is a real number giving the angle (in degrees) to which the object is to be rotated about its z-axis. Activity 31.9 , , , Rewrite the program you created in the previous Activity, replacing the XROTATE, YROTATE and ZROTATE statements with a single ROTATE OBJECT statement, producing the same effect as before. All statements in the previous section rotate an object to a specific angle, 768 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: FIG-31.19 Possible Rotations about
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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