public ArrayList UpdateFrustumSelection(Instance3DCollection InstanceList)
{
ArrayList selected_items = new ArrayList();
Plane[] fplanes;
MdxRender.Camera.GetFrustumPlanes(selectionBoxStartX, selectionBoxStartY,
selectionBoxEndX, selectionBoxEndY, out fplanes);
float test;
//there seems to be a little bit of a plane calculation bug, objects within the bounding box are
//not always selected perfectly
bool bInsideFrustum = false;
int sel_count = 0;
for (int i = 0; i < InstanceList.Count; i++)
{
bInsideFrustum = true;
for (int p = 0; p < fplanes.Length; p++)
//for(int p=0; p<2; p++)
{
test = InstanceList[i].Translation.X * fplanes[p].A +
InstanceList[i].Translation.Y * fplanes[p].B +
InstanceList[i].Translation.Z * fplanes[p].C +
fplanes[p].D;
if (test < 0) //test for behind plane (outside of frustum) (normals point to inside of frustum)
{
bInsideFrustum = false;
break;
}
}
InstanceList[i].Selected = bInsideFrustum;
if (bInsideFrustum)
{
selected_items.Add(InstanceList[i]);
sel_count++;
}
else
{
}
}
//Trace.WriteLine("---------------------------------");
//Trace.WriteLine(string.Format("selected: {0}/{1}", sel_count, this.Count));
//Trace.WriteLine(string.Format("near Nx={0:N3} Ny={1:N3} Nz={2:N3} D={3:N3}", fplanes[0].A, fplanes[0].B, fplanes[0].C, fplanes[0].D));
//Trace.WriteLine(string.Format("far Nx={0:N3} Ny={1:N3} Nz={2:N3} D={3:N3}", fplanes[1].A, fplanes[1].B, fplanes[1].C, fplanes[1].D));
//Trace.WriteLine(string.Format("right Nx={0:N3} Ny={1:N3} Nz={2:N3} D={3:N3}", fplanes[2].A, fplanes[2].B, fplanes[2].C, fplanes[2].D));
//Trace.WriteLine(string.Format("left Nx={0:N3} Ny={1:N3} Nz={2:N3} D={3:N3}", fplanes[3].A, fplanes[3].B, fplanes[3].C, fplanes[3].D));
//Trace.WriteLine(string.Format("top Nx={0:N3} Ny={1:N3} Nz={2:N3} D={3:N3}", fplanes[4].A, fplanes[4].B, fplanes[4].C, fplanes[4].D));
//Trace.WriteLine(string.Format("Bottom Nx={0:N3} Ny={1:N3} Nz={2:N3} D={3:N3}", fplanes[5].A, fplanes[5].B, fplanes[5].C, fplanes[5].D));
return(selected_items);
}
public void Render()
{
// View Frustum Culling
//MdxRender.Camera.CalculateViewFrustum();
// Just for fun, I tried to implement frustum culling based on some code and articles
// that I found. Long story short - it doesn't work ;p
// Maybe it's on the right track and would be a good base to work off of?
// Instance3DCollection culledObjects = new Instance3DCollection();
// foreach (Instance3D instance in this.InnerList)
// {
// // Looks like billboards don't have a bounding box.
// if (instance.Model.m_BoundingBox == null) continue;
//
// Matrix viewMatrix = MdxRender.Camera.GetViewMatrix();
// Vector3 min = new Vector3(instance.Model.m_BoundingBox.min[0],
// instance.Model.m_BoundingBox.min[1],
// instance.Model.m_BoundingBox.min[2]);
// min = Vector3.TransformCoordinate(min, MdxRender.Dev.Transform.View);
//
// Vector3 max = new Vector3(instance.Model.m_BoundingBox.max[0],
// instance.Model.m_BoundingBox.max[1],
// instance.Model.m_BoundingBox.max[2]);
// max = Vector3.TransformCoordinate(max, MdxRender.Dev.Transform.View);
//
// if (MdxRender.Camera.CullAABB(min, max) > 0)
// culledObjects.Add(instance);
// }
// Implemented a more .NET approach to distance sorting.
// Resulted in a 6fps gain on my system (AthlonXP 3000+, Radeon 9800 Pro)
Instance3DCollection culledObjects = this;
culledObjects.DistanceSort();
for (int i = culledObjects.Count - 1; i >= 0; i--)
{
culledObjects[i].Render();
}
//for(int i=0; i<Count; i++)
// for(int i=Count-1; i>=0; i--)
// {
// temp = this[distanceSortArray[i]];
// temp.Render();
// }
multiSelectBox.Render();
//m_DebugObject1.Render();
}