Wednesday, October 26, 2011
Friday, October 15, 2010
There was a question on the Rhino group on LinkedIn about booleans failing due to "Non-Manifold" edges and just what that meant. There are two cases that fall under that heading, and in both cases if your model has them it means you've created a set of surfaces that could not in theory be turned into a real part(not by any conventional means like machining, rapid prototyping processes have their own rules.)
The first case, I'll explain using the simple case of 2D lines. Imagine you've got two lines that form a 90 degree corner, and a third that bisects the angle, so you have three lines meeting at one point. Rhino doesn't let you "Join" those 3 curves into one.
Now in the second case, imagine if you have something like a sphere with a smaller sphere completely inside it, not intersecting at all, and you try to "boolean" the smaller one from the bigger one, if it would let you do it that would also be a non-manifold shape.
Wednesday, October 13, 2010
Automating the production of cutting patterns for hot-air balloons for Sundance Balloons. It involved figuring out how to apply the appropriate distortion so that the design looks correct when inflated; then scripting the detailing of the pattern pieces with seam allowance offsets, labels, alignment marks, and prepping for export to their cutting table software.
Wednesday, July 28, 2010
Sunday, February 14, 2010
Friday, January 29, 2010
Sunday, October 25, 2009
Tuesday, October 20, 2009
Thursday, June 4, 2009
My big issue as a rendering newbie when making studio-style shots was how to get a certain background gradient or solid colour quickly and independently of lighting the actual product.
My previous Brazil tutorial showed a method that works well when looking for a reflection in the 'floor' but was a little elaborate.
To start with this little duck, here's the simple gradient environment that I want to see. It's lit only with global illumination from the environment.
Here it is with a Global Illumination environment, one of the 'Studio' HDRIs included with Brazil.
Now the gradient background is what you see, but the GI environment is providing the lighting and reflections. There is more than one way to do such 'overriding,' but in this case I combined them using a Composite Environment. The GI environment was simply plugged into the first slot and the gradient into the second.
So that the duck doesn't appear to be floating in space, I add a plane.
And finally, the plane is assigned a Matte material. It makes the surface 'invisible' but it still receives shadows (and/or reflections,) and those shadows make the duck appear to actually be sitting on the background.
Buy Brazil here.