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Code archives/3D Graphics - Misc/Line of sight mesh management

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Line of sight mesh management by xmlspy2005
Makes meshes that obstruct view transparent, and then returns them to their normal state. It can be useful for third person camera games, where an object blocks the line of sight from the camera to the player mesh. I think I saw this in Harvest Moon on Game Cube.... Don't remember, anyways, someone can elaborate on the code so there are smooth alpha transitions 
;xmlspy
;Nov. 10, 2005

Graphics3D 640, 480

camera = CreateCamera()
AmbientLight 255, 255, 255

player = CreateCube()
MoveEntity player, 0, 0,10
EntityType player, 1



cube2 = CreateCube()
MoveEntity cube2, 0, 0, 5
EntityPickMode cube2, 1
EntityColor cube2, 255, 0, 0
ScaleEntity cube2, 2,1,1

cube2 = CreateCube()
MoveEntity cube2, 5, 0, 5
EntityPickMode cube2, 1
EntityColor cube2, 255, 0, 0

cube2 = CreateCube()
MoveEntity cube2, -5, 0, 5
EntityPickMode cube2, 1
EntityColor cube2, 255, 0, 0




plane = CreatePlane()
EntityColor plane, 0, 0, 255
MoveEntity plane, 0, -1, 0

Repeat

PointEntity camera,player
move_cam(camera)
	a = CameraPick(camera,GraphicsWidth()/2,GraphicsHeight()/2)
	If a <> b Then
		b = a
		If b > 0 Then EntityAlpha b, .5 : c = b
	Else
		b = 0
		If c > 0 And c <> a Then EntityAlpha c, 1 : c = 0
	EndIf
	
UpdateWorld
RenderWorld
Flip

Until KeyHit(1)


Function Move_Cam( CAM )
		If KeyDown(29) = 0 And KeyDown(157 ) = 0 Then
			;Camera Movement
			
			;Left Right
			If KeyDown(203) Then MoveEntity Cam, -1, 0, 0
			If KeyDown(205) Then MoveEntity Cam, 1, 0, 0
			;Up Down
			If KeyDown(200) Then MoveEntity Cam, 0, 0, 1
			If KeyDown(208) Then MoveEntity Cam, 0, 0, -1
			;AZ
			If KeyDown(30) Then MoveEntity Cam, 0, 1, 0
			If KeyDown(44) Then MoveEntity Cam, 0, -1, 0
				

		ElseIf KeyDown(29) Or KeyDown(157) Then
			;Left Right
			If KeyDown(203) Then TurnEntity Cam, 0, 1, 0 : Return True
			If KeyDown(205) Then TurnEntity Cam, 0, -1, 0 : Return True
			
			;Up Down
			If KeyDown(200) Then TurnEntity Cam, 1, 0, 0 : Return True
			If KeyDown(208) Then TurnEntity Cam, -1, 0, 0 : Return True
				
			;AZ
			If KeyDown(30) Then TurnEntity Cam, 0, 0, 1 : Return True
			If KeyDown(44) Then TurnEntity Cam, 0, 0, -1 : Return True
			
			
		EndIf
End Function

;Pardon da French

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