It looks lik beginRaw() incorrectly exports the result of the last
beginShape()/endShape() command twice, resulting in duplicate 3D faces that
can cause problems for some 3D software. The code below should produce 12
3D faces (3 sets of 2 quads == 12 triangles), but in fact produces 16
because the last two quads are exported twice.

[code]void setup() {
size(400,400,P3D);
noLoop();
}

void draw() {
beginRaw(DXF,"test.dxf");

noStroke();
for(int i=0; i<3; i++) {
beginShape(QUAD_STRIP);
vertex(0,i*100,0);
vertex(0,(i+1)*100,0);
vertex(100,i*100,0);
vertex(100,(i+1)*100,0);
vertex(200,i*100,0);
vertex(200,(i+1)*100,0);
endShape();
}

endRaw();
}
[/code]

how odd.. looked into it a bit and it's not something obvious.. will have
to look further.

great, thanks. it can be particularly problematic when producing graphics
for laser cutting, since duplicate polys get lasered twice.

yep, understood.

Found and fixed for 0146. Turns out P3D (and therefore OpenGL and the rest)
was duplicating a lot of geometry; so this could even mean a bit of a
speedup depending on the situation.