3D Collision Detection

Codea Craft
1

Is there anyway to accurately detect if a rigidbody has collided with another rigidbody?? If so, what would be the smartest thing to code?

Thanks in advance :slight_smile:

2

I don’t think there’s a collision function like in 2D, at least I haven’t seen one. But you can calculate the distance between 2 bodies, subtract their size to see if they’re colliding.

3

Here’s one way of doing it.


viewer.mode=STANDARD

function setup()
    assert(OrbitViewer, "Please include Cameras (not Camera) as a dependency")
    size=1
    fill(255)
    scene = craft.scene()
    skyMaterial=scene.sky.material
    skyMaterial.sky=color(0, 62, 255, 255)
    skyMaterial.horizon=color(99, 255, 0, 255)
    scene.sun.rotation=quat.eulerAngles(20,45,-30)
    createObjects()
    v=scene.camera:add(OrbitViewer, vec3(0,0,0), 30, 0, 200)
end

function createObjects()
    sphere1=scene:entity()
    s1=sphere1:add(craft.rigidbody,DYNAMIC)
    s1.restitution=1
    sphere1.position=vec3(0,5,0)
    sphere1:add(craft.shape.sphere,size)
    sphere1.model = craft.model.icosphere(size,2)
    sphere1.material = craft.material(asset.builtin.Materials.Specular)
    sphere1.material.diffuse=color(255,0,0)
    
    sphere2=scene:entity()
    s2=sphere2:add(craft.rigidbody,STATIC)
    s2.restitution=1
    sphere2.position=vec3(0,-5,0)
    sphere2:add(craft.shape.sphere,size)
    sphere2.model = craft.model.icosphere(size,2)
    sphere2.material = craft.material(asset.builtin.Materials.Specular)
    sphere2.material.diffuse=color(0,0,255)
end

function draw()
    update(DeltaTime)
    scene:draw() 
    calc()   
end

function update(dt)
    scene:update(dt)
end

function calc()
    x=math.abs(sphere1.position.x-sphere2.position.x)
    y=math.abs(sphere1.position.y-sphere2.position.y)
    z=math.abs(sphere1.position.z-sphere2.position.z)
    if x<2 and y<2 and z<2 then
        print("hit")
    end   
end