blitz-research
88 lines
2.5 KiB
HTML
88 lines
2.5 KiB
HTML
<html>
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<head>
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<title>Blitz3D Docs</title>
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<link rel=stylesheet href=../css/commands.css type=text/css>
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</head>
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<body>
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<h1>EntityAlpha entity,alpha#</h1>
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<h1>Parameters</h1>
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<table>
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<tr>
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<td>
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Entity - entity handle
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<br />
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Alpha# - alpha level of entity
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</td>
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</tr>
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</table>
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<h1>Description</h1>
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<table>
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<tr>
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<td>
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Sets the entity alpha level of an entity.
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The alpha# value should be in a floating point value in the range 0-1. The default entity alpha setting is 1.
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<br />
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The alpha level is how transparent an entity is. A value of 1 will mean the entity is opaque. A value of 0 will mean the entity is completely transparent, i.e. invisible. Values between 0 and 1 will cause varying amount of transparency. This is useful for imitating the look of objects such as glass and other translucent materials.
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An EntityAlpha value of 0 is especially useful as Blitz3D will not render entities with such a value, but will still involve the entities in collision tests. This is unlike HideEntity, which doesn't involve entities in collisions.
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</td>
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</tr>
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</table>
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<h1><a href=../3d_examples/EntityAlpha.bb>Example</a></h1>
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<table>
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<tr>
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; EntityAlpha Example
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; -------------------
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Graphics3D 640,480
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SetBuffer BackBuffer()
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camera=CreateCamera()
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light=CreateLight()
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RotateEntity light,90,0,0
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cube=CreateCube()
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Back=CreateCube()
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PositionEntity cube,0,0,5
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PositionEntity back,0,0,15
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ScaleEntity Back,10,2,1
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EntityColor back,255,0,0
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; Set initial entity color values
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Alpha#=1
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While Not KeyDown( 1 )
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; Change alpha value depending on key pressed
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If alpha#<0.01 Then alpha# = 0
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If alpha#>1 Then alpha# = 1
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If KeyDown( 2 )=True And Alpha#>0 Then Alpha#=Alpha#-0.01
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If KeyDown( 3 )=True And alpha#<1 Then Alpha#=Alpha#+0.01
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; Set entity alpha value
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EntityAlpha cube,Alpha#
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TurnEntity cube,0.1,0.1,0.1
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TurnEntity back,1,0,0
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RenderWorld
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Text 0,0,"Press keys 1-2 to change EntityAlpha"
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Text 0,20,"Entity Alpha: "+Alpha
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Flip
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Wend
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End
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</td>
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</tr>
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</table>
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<br>
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<a target=_top href=../index.htm>Index</a><br>
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<br>
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Click <a href=http://www.blitzbasic.co.nz/b3ddocs/command.php?name=EntityAlpha&ref=comments target=_blank>here</a> to view the latest version of this page online</body>
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</html>
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