Hands On DarkBASIC Pro - Digital Skills

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Summary Activity 32.24 In your last program, add the line GHOST OBJECT ON 1,0 immediately before the DO..LOOP structure. How does this affect the cube? There's still more to be said about texturing objects but we'll leave that to a later chapter after we've covered other basic concepts such as cameras and lighting. � Use COLOR OBJECT to tint the surface of a 3D object. � Use GHOST OBJECT ON to make an object transparent. � Use GHOST OBJECT OFF to make a transparent object opaque. � Use FADE OBJECT to reduce the amount of light reflected by an object. � When used on a transparent object, FADE OBJECT can make that object invisible. � When used on an opaque object, FADE OBJECT can make that object completely black. DarkBASIC Pro: Texturing 819
Images with an Alpha Channel Introduction As we saw back in Chapter 30, some picture files contain an alpha channel which can affect the visibilty of the main image. This type of picture file, when used as a texture, affects the overall result obtained. Using Images with an Alpha Channel FIG-32.28 An Image and its Alpha Channel LISTING-32.14 Texturing with Alpha-Channel Images The image windmillshaped.tga contains an image and an alpha channel as shown in FIG-32.28. We've already seen that the SET OBJECT TRANSPARENCY statement affects the black area of an texture image, but the statement also controls how an alpha channel within an image affects the final texture. The program in LISTING 32-14 textures as cube using windmillshaped.tga. With the default settings, the alpha channel within the image has no effect on the texturing of the cube, but after a SET OBJECT TRANSPARENCY statement is used to modify the texturing, the alpha channel changes the final look of the cube. REM *** Set display resolution *** SET DISPLAY MODE 1280, 1024,32 REM *** Create cube *** MAKE OBJECT CUBE 1,10 REM *** Texture cube *** LOAD IMAGE "windmillshaped.tga",1 TEXTURE OBJECT 1,1 REM *** Rotate cube *** DO REM *** IF key pressed, use alpha channel *** IF INKEY$() "" SET OBJECT TRANSPARENCY 1,1 ENDIF TURN OBJECT LEFT 1,1 LOOP REM *** End program *** END Activity 32.25 Image Alpha Channel Type in and test the program in LISTING-32.14 (texture14.dbpro). 820 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
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FIG-31.16 The MOVE OBJECT Statement
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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 and 100: LISTING-32.10 (continued) Using the
Page 101 and 102: FIG-32.24 A Transparent Cube Activi
Page 103: FIG-32.27 The FADE OBJECT Statement
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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