Cycling 74 » Topic: jit.gen & quaternions http://cycling74.com/forums/topic/jit-gen-quaternions/feed Wed, 19 Jun 2013 10:58:58 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/jit-gen-quaternions/#post-39881 <![CDATA[jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-39881 Sat, 07 Jul 2012 13:23:15 +0000 Julien Bayle Hi there,
is there a way to use easily quaternions with jit.gen ??

I need to process a 3 planes matrix with x,y,z space coordinates with jit.gen (which is okay) but my calculation involves quaternions.
Each row of coordinates have to be multiplied by quaternions & quaternions conjugates.

anyone already did that with jit.gen ?
if someone could help even outside of gen, I’d be happy :D

]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140636 <![CDATA[Re: jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140636 Mon, 09 Jul 2012 19:47:09 +0000 Rob Ramirez hi julien. below is a patch that rotates vectors by a quaternion using jit.gen.

– Pasted Max Patch, click to expand. –
]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140637 <![CDATA[Re: jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140637 Mon, 09 Jul 2012 20:12:00 +0000 Julien Bayle Hi Robert,
thanks a lot for your patch.
I’ll try it asap in my system.
I’ll grab the quat from jit.anim.node in order to not have problem with gimbal lock coming from euler angles, but I guess the jit.gen calculations remain the same.

posting when I’ll have tested it.

]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140638 <![CDATA[Re: jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140638 Sat, 14 Jul 2012 16:42:48 +0000 Julien Bayle I guess I'm VERY near from my solution.

I'm rotating my vectors by the quaternion rotation.
each vector is made by (objectVector – camVector)

I included your codebox into mine and put the azimuth & elevation calculation in another codebox.

I don't know if it is a problem of vector normalization or whatever, but it still doesn't work.
if I move the camera “around” the object, by keeping the object in the center of my view, I should still have az=0 & el=0 … this is basic and I absolutely don't understand why I don't have that :-(

[attachment=199341,4181]

]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140639 <![CDATA[Re: jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140639 Thu, 19 Jul 2012 08:29:54 +0000 Julien Bayle Robert, can I request some help ?
I’m still stuck.
I don’t understand where my logic fails

]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140640 <![CDATA[Re: jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140640 Wed, 25 Jul 2012 11:18:37 +0000 Julien Bayle I tried to grab the rotation quaternion of my cam from jit.anim.node, gl.camera .. it doesnt work better
This is a calculation error (in the part I made for sure) and I cannot debug it :-(

]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140641 <![CDATA[Re: jit.gen & quaternions]]> http://cycling74.com/forums/topic/jit-gen-quaternions/#post-140641 Thu, 09 Aug 2012 08:50:16 +0000 Julien Bayle anyone else would help me ?

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