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7 posts tagged with 3D and geometry. (View popular tags)
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Help with 2D transforms in ellipse drawing algorithm

I'm trying to draw a 3D ellipse with a 2.5D graphics engine (Core Animation layers) which allow me to only compose my ellipse with line segments that must be moved into place using rotations and translations. I'm having trouble with the order of operations and can't get it to draw properly. Any graphics gurus or game programmers out there who can help me? [more inside]
posted by krunk on Sep 1, 2014 - 7 answers

3D graphics in a 2D context (for dummies)

HTML5 canvas question: I'm trying to model a 2D grid in 3D space and it's not working right. Can you help? [more inside]
posted by The Winsome Parker Lewis on Apr 17, 2012 - 10 answers

DIY Forced-Perspective wall-hanging art/mathematics advice sought.

3-D folks, Mathematicians, and Artists: Trying to create my own Trompe-l'œil / forced perspective illusionary image to hang on my wall (e.g. the awesome parking garage signage everyone's already seen... more examples here, and here). I'm having trouble faking it with 2-D programs, and the math is puzzling me. [more inside]
posted by jjjjjjjijjjjjjj on Jan 9, 2009 - 34 answers

3D Trig question

3D Trig question: I have a 2D square in 3D space (a Face). I know the positions of the four corner vertices in form x,y,z. How do I calculate the rotation in degrees (Euler angles) as relative from the center of the face? I want to end up with degrees of rotations around x-axis,y-axis,z-axis. Bonus if you can write it in pseudocode.
posted by pooya on May 9, 2007 - 7 answers

How can I work out if a point x,y,z is contained by a cone ?

How can I work out if a point x,y,z is contained by a cone ? [more inside]
posted by matholio on Jan 14, 2007 - 15 answers

rotation shmotation

Vector Geometry Filter: I'm working in matlab and need to transform a surface to match an arbitrary angle. I have the unit vector of the new normal (and the original normal is in the Z axis (0 0 1))...however i'm not sure how to rotate one normal to another (i know, i know, it sounds very simple really...) [more inside]
posted by NGnerd on Oct 23, 2006 - 5 answers

3D interactive geometry software

Do you know of any 3D interactive geometry software? I would like to have the power of Cabri / Geometer's Sketchpad in 3D.
posted by MzB on Feb 3, 2004 - 0 answers

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