Thanks for unlocking my broken trig head. This should really be in the documentation. The angle is in radians. Patch enclosed...
Best, Ed Metastudio 3 for Pure Data - Free download at: http://sharktracks.co.uk/puredata ----- Original Message ---- From: Claude Heiland-Allen <[email protected]> To: Ed Kelly <[email protected]> Cc: PD List <[email protected]> Sent: Wed, 1 September, 2010 1:09:43 Subject: Re: [PD] GEM Shear / angle relationship Hi Ed, On 31/08/10 15:31, Ed Kelly wrote: > Can anyone tell me how to calculate the 'shear' value (when using [shearYX] in > Gem) from an angle (degrees or radians, I don't mind)? This is just a guess, for one direction of shear in 2D space: shear = tan(angle) (the angle marked ** in the ascii diagram below) | __________ |**/ / | / / |/_________/ (because tan(0) = 0, tan(45deg) = 1, tan(90deg) = inf) Otherwise try drawing triangles and doing some trigonometry (in a right-angle triangle: sin=opposite/diagonal cos=adjacent/diagonal tan=opposite/adjacent ) Claude -- http://claudiusmaximus.goto10.org
angle_shear.pd
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