collision
Blitz3D Forums/Blitz3D Beginners Area/collision
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| can anyone tell me, in simplest terms, how to make collision detection? thats all i wanna know. |
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| Blitzd contains commands to detect Collision detection. They are Collisions and Entity Collisions. In the Manuals tab on this website look under the Globals section of the 3d category section. They have examples for their usage. |
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| For your main character entity, use EntityType char, 1 EntityRadius char, 1 For your world mesh, use EntityType world, 2 Then, enable collisions with Collisions 1, 2, 2, 4 And in your main loop, use UpdateWorld RenderWorld Blitz3d collisions are allways sphere-to-something, so that is why you must set the radius for your character mesh. |
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| Does anyone know of a way to check for collisions without triggering one of the automatic responses: Stop, slide1, or slide2. For example, say I've attached/parented a Pivot to a animating boxer's hand bone. That way the Pivot moves where ever the boxer puts his hand. I want to be alerted anytime that Pivot collides with a punchable object. Collision will do that, but every time the Pivot hits something, it stops or slides, thus moving it off of the boxer's hand bone. I can repossession the Pivot after each collision, but that seems like a poor solution to the problem. |
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| i just tried it, but the example doesnt work. this is what im talking about!!!! can anyone make an example where i can just plug the entities in to run it? |
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| Do you mean it doesn't work as in it doesn't run, or it doesn't work as in you can't change the collision type with the R and M keys? |
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| ill just put the code and let you decide lol Graphics3D 0,0,0,1 SetBuffer BackBuffer() CT = LoadMesh ("collisiontest.3ds") PositionEntity CT,20,10,2 EntityType CT,2 EntityRadius ct,5 camera=CreateCamera() EntityRadius camera,5 PositionEntity camera,1,1,1 EntityType camera,1 light=CreateLight() ; Set terrain detail, enable vertex morphing TerrainDetail terrain,4000,True ; Scale terrain ScaleEntity terrain,1,50,1 ; Texture terrain ScaleEntity terrain,1,50,1 PositionEntity terrain,0,0,5 grass_tex=LoadTexture( "texture1.bmp" ) EntityTexture terrain,grass_tex,0,1 ScaleTexture grass_tex,75,75 EntityTexture terrain,grass_tex,0,1 While Not KeyDown( 1 ) If KeyDown( 203 )=True Then x#=x#-0.1 If KeyDown( 205 )=True Then x#=x#+0.1 If KeyDown( 208 )=True Then y#=y#-0.1 If KeyDown( 200 )=True Then y#=y#+0.7 If KeyDown( 44 )=True Then z#=z#-0.1 If KeyDown( 30 )=True Then z#=z#+0.1 If KeyDown( 205 )=True Then TurnEntity camera,0,-1,0 If KeyDown( 203 )=True Then TurnEntity camera,0,1,0 If KeyDown( 208 )=True Then MoveEntity camera,0,0,-0.1 If KeyDown( 200 )=True Then MoveEntity camera,0,0,0.7 x#=EntityX(camera) y#=EntityY(camera) z#=EntityZ(camera) terra_y#=TerrainY(terrain,x#,y#,z#)+10 PositionEntity camera,x#,terra_y#,z# UpdateWorld RenderWorld Collisions camera, ct, 1, 2 Collisions CT, camera, 1, 2 Flip Wend End |
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| I see one problem off the bat. Collisions camera, ct, 1, 2 Collisions CT, camera, 1, 2 This should be Collisions 1, 2, 1, 2 Collisions 2, 1, 1, 2 Your supposed to use entity_types (numbers) rather than actual entities in collisions. |
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| YESSSSSSS!!!! YEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEESSSSSS!!! That's IT!!!! you dont know HOW LONG ive been trying to find that out! a year at least!!!! if you go on search my subjects on this are on there a ton! but THANK you! you dont know how much i needed this! thx again! bye |
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| :D Being helpful is fun. |
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| I'd suggest looking at the 3d samples that come with Blitz3D to see collision code in action. Bear in mind that collisions don't work against non sphere/ellipsoid collision target objects that are moving towards the source object (which must be a sphere/ellipsoid). Also, I've never gotten much sense out of ellipsoidal collisions. It seems like the aspect ratio needs to be the same for all the collision ellipsoids used, which makes them fairly useless. Collisions only have stop and slide response types available. For a no-respose type you will need to use a collision proxy. Try the link below for example code. http://www.blitzbasic.com/codearcs/codearcs.php?code=1901 |
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