i want to make a wall with an arched window, for the shape of an arch a thought i would make the arch with a different program then import as a dfx make it negative then group with wall then i should have a arched hole in the wall,but it dosent work,can it not be done with dfx.

You can do it with Bryce. Take a cylinder primitive, elongate it to the shape of the arch top. Change it to a negative. Take a cube prim, and shape it to the lower part of your arched window. Change it to a negative. Mate the two parts until they give you the RED shape in your pic above and GROUP. Turn your wall to positive and interesect your new negative cylinder/cube shape. Now GROUP again and you should have an arched shaped hole in your wall. I hope this helps. Regards The Bryster. (Chris)

is the wall set to positive? and is in the smoothing options of the dxf the opdion "solid when boolean" active? hope it helps cheers

(I second Vasquez) Yeah, that's the most overlooked piece of the puzzle, with your dxf selected, choose the little letter "E". In the "Edit Mesh" window that comes up there is a small button that says "solid when boolean rendering". Make sure that is clicked or it won't work. AgentSmith

But...like cshaftoe said, this can be done in Bryce alone with only 3 primitives. Also, doing it with just Bryce will (probably) keep your bryce scene file down in size and it will make the top of your arch very round instead of "polygonal jagged". AgentSmith

Looks like this.

Or use IMSI floor plan which is a very cheap program and texture in Bryce.

Hmmm... I know that when I did something like this, it seemed best if all the objects in the window group are actually positive. Then the window group as a whole is set to negative. Then grouped again with a positive wall. It's funny what you can do with successive layers of grouping too. Boolean grouping heiarchy has to be thought out. Not to mention that sometimes if something doesn't work, you have to look for that layer of grouping that wasn't set positive etc. Also note the solid thing on the mesh smoothing (the little edit box on imported meshes.) If you're boolean operation involves imported meshes you'll either end up with a hollow mesh or a cookie cutter (as in your case) if it's not set to solid.