--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_collision.nim	Sat Jun 03 13:32:15 2023 +0700
@@ -0,0 +1,67 @@
+import semicongine
+
+
+proc main() =
+  var scene = newScene("main", root=newEntity("rect"))
+
+  var obj1 = newEntity("Obj1", rect(color="f00f"))
+  var obj2 = newEntity("Obj2", rect())
+  var obj3 = newEntity("Obj3", circle(color="0f0f"))
+  
+  scene.root.add obj2
+  scene.root.add obj1
+  scene.root.add obj3
+  obj1.transform = scale3d(0.8, 0.8)
+  obj3.transform = scale3d(0.1, 0.1)
+  obj1.add HitBox(transform: translate3d(-0.5, -0.5, -0.5))
+  obj2.add HitBox(transform: translate3d(-0.5, -0.5, -0.5))
+  obj3.add HitSphere(radius: 0.5)
+
+  const
+    vertexInput = @[
+      attr[Mat4]("transform", memoryPerformanceHint=PreferFastRead, perInstance=true),
+      attr[Vec3f]("position", memoryPerformanceHint=PreferFastRead),
+      attr[Vec4f]("color", memoryPerformanceHint=PreferFastRead),
+    ]
+    intermediate = @[attr[Vec4f]("colorout"),]
+    uniforms = @[attr[Mat4]("perspective")]
+    fragOutput = @[attr[Vec4f]("fragcolor")]
+    (vertexCode, fragmentCode) = compileVertexFragmentShaderSet(
+      inputs=vertexInput,
+      intermediate=intermediate,
+      outputs=fragOutput,
+      uniforms=uniforms,
+      vertexCode="""gl_Position = vec4(position, 1.0) * (transform * Uniforms.perspective); colorout = color;""",
+      fragmentCode="""fragcolor = colorout;""",
+    )
+
+  var engine = initEngine("Test collisions")
+  engine.setRenderer(engine.gpuDevice.simpleForwardRenderPass(vertexCode, fragmentCode))
+  engine.addScene(scene, vertexInput, @[])
+  scene.addShaderGlobal("perspective", Unit4F32)
+
+  while engine.updateInputs() == Running and not engine.keyIsDown(Escape):
+    if engine.windowWasResized():
+      var winSize = engine.getWindow().size
+      scene.setShaderGlobal("perspective", orthoWindowAspect(winSize[1] / winSize[0]))
+    if engine.keyIsDown(A): obj1.transform = obj1.transform * translate3d(-0.001,      0, 0)
+    if engine.keyIsDown(D): obj1.transform = obj1.transform * translate3d( 0.001,      0, 0)
+    if engine.keyIsDown(W): obj1.transform = obj1.transform * translate3d(     0, -0.001, 0)
+    if engine.keyIsDown(S): obj1.transform = obj1.transform * translate3d(     0,  0.001, 0)
+    if engine.keyIsDown(Q): obj1.transform = obj1.transform * rotate3d(-0.001, Z)
+    if engine.keyIsDown(Key.E): obj1.transform = obj1.transform * rotate3d( 0.001, Z)
+
+    if engine.keyIsDown(Key.Z): obj2.transform = obj2.transform * rotate3d(-0.001, Z)
+    if engine.keyIsDown(Key.X): obj2.transform = obj2.transform * rotate3d( 0.001, Z)
+    if engine.keyIsDown(Key.C): obj2.transform = obj2.transform * translate3d(0, -0.001, 0)
+    if engine.keyIsDown(Key.V): obj2.transform = obj2.transform * translate3d(0,  0.001, 0)
+    var hb1 = HitBox(obj1.components[1])
+    var hb2 = HitBox(obj2.components[1])
+    var hb3 = HitSphere(obj3.components[1])
+    echo overlaps(hb1, hb3)
+    engine.renderScene(scene)
+  engine.destroy()
+
+
+when isMainModule:
+  main()