//This method is performing basic collision detection between two models
//Whole model is surrounded by BoundingBox stored in model.Tag info
public static bool GeneralDecorationCollisionCheck(GameObject unit, GameObject decoration)
{
//Retrieving data about BoundingBox from model.Tag for first model
ModelExtra animationData1 = unit.currentModel.Model.Tag as ModelExtra;
BoundingSphere originalBox1 = animationData1.boundingSphere;
BoundingSphere Box1 = XNAUtils.TransformBoundingSphere(originalBox1, unit.GetWorldMatrix());
//Doing the same thing for second model
ModelExtra animationData2 = decoration.currentModel.Model.Tag as ModelExtra;
BoundingBox originalBox2 = animationData2.boundingBox;
BoundingBox Box2 = XNAUtils.TransformBoundingBox(originalBox2, decoration.GetWorldMatrix());
Building deco = (Building)decoration;
deco.boundingBox = Box2;
//Checking if global bounding Box(surronds whole model) intersects another Box
bool collision = Box1.Intersects(Box2);
return collision;
}
//This method performs much more detailed collision check.
//It checks if there is collision for each mesh of model
public static bool DetailedDecorationCollisionCheck(GameObject unit, GameObject deco)
{
Building decoration = (Building)deco;
//first we check if there is general collision between two models
//If method returns false we dont have to perform detailed check
if (!GeneralDecorationCollisionCheck(unit, decoration))
return false;
//Here we are creating BoundingBox for each mesh for model1
Matrix[] model1Transforms = new Matrix[unit.currentModel.Model.Bones.Count];
unit.currentModel.Model.CopyAbsoluteBoneTransformsTo(model1Transforms);
BoundingSphere[] model1Boxs = new BoundingSphere[unit.currentModel.Model.Meshes.Count];
for (int i = 0; i < unit.currentModel.Model.Meshes.Count; i++)
{
ModelMesh mesh = unit.currentModel.Model.Meshes[i];
BoundingSphere origSphere = mesh.BoundingSphere;
Matrix trans = model1Transforms[mesh.ParentBone.Index] * unit.GetWorldMatrix();
BoundingSphere transBox = XNAUtils.TransformBoundingSphere(origSphere, trans);
model1Boxs[i] = transBox;
}
bool collision = false;
//Check if any of created before Boxs intersects with another Box
for (int i = 0; i < model1Boxs.Length; i++)
for (int j = 0; j < decoration.meshBoundingBoxes.Count; j++)
if (model1Boxs[i].Intersects(decoration.meshBoundingBoxes[j]))
return true;
return collision;
}
