Hands On DarkBASIC Pro - Digital Skills

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Other Visual Effects Introduction Although adding texture to a 3D object is the commonest way of changing an object's appearance, it is by no means the only option available. In this section we'll see some other options that are available to us in DarkBASIC Pro. Changing Colour and Transparency FIG-32.23 The COLOR OBJECT Statement LISTING-32.11 The COLOR OBJECT Statement Using COLOR OBJECT Rather than add a texture to a 3D object, we can give it a surface of a specific colour using the COLOR OBJECT statement which has the format shown in FIG-32.23. In the diagram: COLOR OBJECT objno colour objno is an integer value specifying the object which is to be coloured. colour is an integer value specifying the colour to be used on the object's surface. For example, we could give object 1 a red surface using the line: COLOR OBJECT 1, RGB(255,0,0) An example of this statement in operation is given in LISTING-32.11 which colours a rotating cube in red, changing to green when a random event occurs. REM *** Set display resolution *** SET DISPLAY MODE 1280,1024,32 REM *** Seed random number generator *** RANDOMIZE TIMER() REM *** Make and position cube *** MAKE OBJECT CUBE 1, 40 POSITION OBJECT 1,25,0,100 REM *** Colour cube red *** COLOR OBJECT 1, RGB(255,0,0) REM *** Rotate Cube *** DO PITCH OBJECT DOWN 1, 1.0 TURN OBJECT LEFT 1, 1.0 REM *** One chance in 1000 of changing to green *** IF RND(1000) = 500 COLOR OBJECT 1, RGB(0,255,0) ENDIF LOOP REM *** End program *** END DarkBASIC Pro: Texturing 815 ,
FIG-32.24 A Transparent Cube Activity 32.20 Type in and test the program given in LISTING-32.11 (texture11.dbpro). A coloured surface cannot be used in conjunction with a main texture, but secondary textures (created using SET DETAIL MAPPING ON) may still be used. Activity 32.21 Modify your last program so that DoNot.bmp is used as a secondary texture on the surface of the cube. The GHOST OBJECT ON Statement You'll have to look closely to see the cube! FIG-32.25 The GHOST OBJECT ON Statement In FIG-32.24 we can see a cube which is semi-transparent with the grided plane in the background showing through the cube. We can create this effect using the GHOST OBJECT ON statement which has the format shown in FIG-32.25. In the diagram: GHOST OBJECT ON objno , ghostflag objno is an integer value specifying the 3D object to be made semi-transparent. ghostflag is 0 to 5. 0 - object is semi-transparent 1 - object uses negative transparency 2 - object is semi-transparent but lighter 3 - uses the image's alpha channel 4 - similar to 1 but lighter 5 - object is opaque The program in LISTING-32.12 demonstrates the effect of this instruction by rotating the cube with a textured plane in the background. 816 DarkBASIC Pro: Texturing
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Hands On DarkBASIC Pro A Self-Study
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Copyright © Alistair Stewart 2006
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The TURN OBJECT Statement . . . . .
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The YROTATE CAMERA Statement . . .
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Chapter 35 Meshes and Limbs Meshes.
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The OBJECT IN SCREEN Statement . .
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The MAKE OBJECT COLLISION BOX State
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Adding MoveElevator() . . . . . . .
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The RANDOMIZE MATRIX Statement . .
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The MAKE MEMBLOCK FROM SOUND Statem
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The TRANSPOSE MATRIX4 Statement . .
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Networking the Game . . . . . . . .
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Acknowledgements I would like to th
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Syntax Diagrams make only a half-he
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The 3D World Introduction The Coord
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FIG-30.4 Points Determining the Pos
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FIG-30.6 Rotation A Cuboid is Rotat
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FIG-30.13 Varying the Polygons in a
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FIG-30.17 Lights Surface Normals FI
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� Space within the 3D world is me
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3D Primitives Introduction FIG-31.1
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FIG-31.5 The MAKE OBJECT BOX Statem
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FIG-31.9 The MAKE OBJECT CONE State
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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 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: LISTING-32.10 (continued) Using the
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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