Blitz3d collisions (again) + bounce physics

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Socoder -> Blitz -> Blitz3d collisions (again) + bounce physics
Thu, 10 Jun 2010, 08:22
j\\'ordos	Hi! I'm having some problems with the blitz3d built-in collision detection. I have a simple 3D tank maze game. Collisions are defined, Entitytype is setup properly and updateworld is called (once) each loop. The collisions work fine most of the time, but if I move my tank towards a wall and then fire a bullet (sprite) while still moving at the same time I move through the walls! Obviously I don't want this. Is there anything I can do to keep using the blitz collisions so I can keep the sliding? Here is the setup: l.lvl=New lvl For z=1 To 15 For x=1 To 20 Select level(x,z) Case 1 l\cube[xz]=CreateCube() HideEntity l\cube[xz] l\startx[0]=x5 l\startz[0]=z5 Case 2 l\cube[xz]=CreateCube() HideEntity l\cube[xz] l\startx[1]=x5 l\startz[1]=z5 Case 5 ;If level(x,z+1)=5 ; z2=z ; Repeat ; level(x,z)=0 ; z=z+1 ; Until level(x,z)<>5 ; z=z-1 ; ;If x=x2+1 ; z2=z ; Repeat ; z=z+1 ; Until z<>5 ;EndIf l\cube[xz]=CreateCube() ScaleMesh l\cube[xz],2.5,1,2.5 PositionEntity l\cube[xz],x5,0,z5 EntityType l\cube[xz],3 EntityBox l\cube[xz],-2.3,-.2,-2.3,4.6,.4,4.6 EntityFX l\cube[xz],4 EntityBlend l\cube[xz],2 EntityColor l\cube[xz],0,0,255 End Select Next Next t.tank=New tank t\ent=LoadMesh("gfx\3d\tank.3ds") t\controller=1 t\id=0 t\life=3 ScaleMesh t\ent,.08,.08,.08 RotateEntity t\ent,0,180,0 PositionEntity t\ent,l\startx[0],0,l\startz[0] EntityType t\ent,1 EntityRadius t\ent,1.4 EntityPickMode t\ent,2 EntityFX t\ent,4 t\brush[0]=CreateBrush(128,128,128) t\brush[1]=CreateBrush(97,123,194) BrushShininess t\brush[1],.35 t\brush[2]=CreateBrush(255,255,0) ns=CountSurfaces(t\ent) For cns=1 To ns-1 surf=GetSurface(t\ent,cns) PaintSurface surf,t\brush[cns-1] Next camera=CreateCamera() PositionEntity camera,l\startx[0],.6,l\startz[0]+.66 CameraFogMode camera,1 CameraFogRange camera,1,100 CameraRange camera,.4,100 EntityParent camera,t\ent Global bullet=LoadSprite("gfx\2d\spark.bmp") ScaleSprite bullet,.8,.8 EntityRadius bullet,.4 EntityType bullet,4 HideEntity bullet Collisions 1,1,1,2 ;tank-tank Collisions 1,3,2,2 ;tank-wall Collisions 4,3,2,1 ;bullet-wall --v Secondly, is there a way to do simple, pong-like bouncing for the bullets when they hit a wall without keeping track of their angle and velocity myself? (using turnentity or so) Thanks! edit: for completeness sake, here is the main loop too: While Not KeyHit(1) For t.tank= Each tank If t\dead=False If t\controller=0 Update_AI(t) Else ; move the player if the forward or back keys are pressed If KeyDown(208)=True Then MoveEntity t\ent,0,0,.07 If KeyDown(200)=True Then MoveEntity t\ent,0,0,-.07 ; turn the player if the left and right keys are pressed If KeyDown(203)=True Then TurnEntity t\ent,0,.5,0 If KeyDown(205)=True Then TurnEntity t\ent,0,-.5,0 If KeyHit(57) b.bullet=New bullet b\ent=CopyEntity(bullet,t\ent) EntityParent(b\ent,0) MoveEntity b\ent,0,.6,-1.8 ResetEntity b\ent ResetEntity t\ent EndIf EndIf EndIf Next For b.bullet=Each bullet If EntityCollided(b\ent,3) ;DebugLog(EntityPitch(b\ent)) TurnEntity b\ent,0,-EntityYaw(b\ent),0 ResetEntity b\ent EndIf hit=LinePick(EntityX(b\ent),EntityY(b\ent),EntityZ(b\ent),.1,.1,-.1,.4) If hit=0 MoveEntity b\ent,0,0,-.12 b\life=b\life+1 If b\life=100 FreeEntity b\ent Delete b EndIf Else For t.tank=Each tank If t\ent=hit create_explosion(t) PositionEntity t\ent,l\startx[t\id],0,l\startz[t\id] EndIf Next FreeEntity b\ent Delete b EndIf Next update_particles() UpdateWorld RenderWorld ;For z=1 To 15 ; For x=1 To 20 ; If l\cube[xz]<>0 Then ResetEntity l\cube[xz] ; Next ;Next Flip Wend --v
Fri, 11 Jun 2010, 02:53
Jayenkai	I had SO many issues with 3D collisions that I eventually cheated it. If your "3D Maze" can be re-represented as a 2D maze, try to keep a 2D copy somewhere in memory, and keep referring back to that. That way, you can double check if the player's popped his way through a wall, by referring to the 2D version. .. Maybe that's wrong, but I'm rubbish at 3D! -=-=- ''Load, Next List!''
Fri, 11 Jun 2010, 08:34
j\\'ordos	That will probably work fine but how do I go about keeping the sliding effect then?