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CollisionTriangle

Blitz3D Forums/Blitz3D Programming/CollisionTriangle

BlitzBasic303(Posted 2007) [#1]
Hi,

I have a problem with CollisionTriangle, at first I going to show you the code:

Graphics3D 1024,768,32,1
SetBuffer BackBuffer()

Camera=CreateCamera()
MoveEntity camera,0,1000,0
CameraRange camera,1,10000

ball=LoadMesh("Ball.3ds")
RotateEntity ball,0,45,0
EntityRadius Ball,10
EntityType ball,1

parcours=LoadMesh("Bahn1.3ds")
EntityType parcours,2

While Not KeyHit(1)
Collisions 1,2,2,1

PointEntity camera,ball
MoveEntity ball,0,0,1

If EntityCollided(ball,2) Then
Vertex1=TriangleVertex(CollisionSurface(parcours,CountCollisions(parcours)),CollisionTriangle(parcours,CountCollisions(parcours)),1)
Vertex2=TriangleVertex(CollisionSurface(parcours,CountCollisions(parcours)),CollisionTriangle(parcours,CountCollisions(parcours)),2)
End If

RenderWorld
UpdateWorld
Flip 0
Wend


Ok, now I tell you my problem. I want to find the collided triangle of the parcours, but that is impossible because the ball collides with the parcours, not the parcours with the ball, so I can only find the collided triangle of the ball (do you know what I mean?). But how can I find the collided triangle of the parcours?

gratefully,

BlitzBasic303


Stevie G(Posted 2007) [#2]
Like this maybe ...

Graphics3D 1024,768,32,1
SetBuffer BackBuffer()

Camera=CreateCamera()
MoveEntity camera,0,1000,0
CameraRange camera,1,10000

ball=LoadMesh("Ball.3ds")
RotateEntity ball,0,45,0
EntityRadius Ball,10
EntityType ball,1

parcours=LoadMesh("Bahn1.3ds")
EntityType parcours,2

While Not KeyHit(1)
Collisions 1,2,2,1

PointEntity camera,ball
MoveEntity ball,0,0,1

If EntityCollided(ball,2) Then
	For c = 1 To CountCollisions( ball )
		Triangle = CollisionTriangle( ball , c ) 
		Vertex0=TriangleVertex( CollisionSurface( ball, c ), Triangle , 0 )
		Vertex1=TriangleVertex( CollisionSurface( ball, c ), Triangle , 1 )
		Vertex2=TriangleVertex( CollisionSurface( ball, c ), Triangle , 2 )
	Next
End If

RenderWorld
UpdateWorld
Flip 0
Wend



BlitzBasic303(Posted 2007) [#3]
No, i think you didn't unterstand me, I wanted to find the collided triangle of the parcours, not the one of the ball.


Stevie G(Posted 2007) [#4]
Nope, I don't think you understand how the collision commands work.

If the ball has collided with something it must be the 'parcours' ( whatever that is?? ). Therefore the collisiontriangle( ball, c ) will return the triangle index on the 'parcours'. Logically, the ball cannot collide with itself.

Have you read or tried using the code I posted?

Stevie


BlitzBasic303(Posted 2007) [#5]
Ohhh I'm so stupid! You're right! Sorry! Now it works!