Hi Michael, I tried again and this time OpenSCAD built the .stl! I don't know why the last time id didn't!!! Thanks for your answer! -- Sent from: http://forum.openscad.org/

Hi lar3ry, I went crazy to find a solid to subtract from the main pyramid at first but I couldn't get it! I've so much to learn about OpenSCAD! Thanks a lot! -- Sent from: http://forum.openscad.org/

 square(side,center=true);

 pyramid(150,100);

 translate([ a, d, b]) pyramid(150,100);

 translate([-a,-d, b]) pyramid(150,100);

 translate([ 0, 0, c]) pyramid(150,100);

Ronaldo wrote >> >> > I haven't checked your code yet but it seems that it might be easier to >> > excavate with the pyramid itself. >> >> I'd be interested to see how you could do that. >> > > There are many alternatives. Here is one: > > module pyramid(height, side) { > > linear_extrude(height,scale=0.1/height) > > square(side,center=true); > > } > > Hi Ronaldo, > > I see it works but just can't figure out why!!! > I can't understand how the sutracting pyramids don't cut out the edges of > the main pyramid! > I need to study it again and again: I tried commenting some statements to > simplify the model but had no success. > Thanks for upgrading my OpenSCAD knowledge. > > > module A(height,side,a,b,c,d) > > difference(){ > > pyramid(150,100); > > translate([ a, d, b]) pyramid(150,100); > > translate([-a,-d, b]) pyramid(150,100); > > translate([ 0, 0, c]) pyramid(150,100); > > } > > > a = 5; > > b = 4; > > c = 11; > > union() { > > A(150,100,a,b,-c,-a); > > A(150,100,a,b,-c, a); > > } > > You will need some trigonometry to calculate a, b and c from the pyramid > height and side and the width of the studs. > > _______________________________________________ > OpenSCAD mailing list > Discuss@.openscad > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org -- Sent from: http://forum.openscad.org/