coordinate system 3DGS -> D3D

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coordinate system 3DGS -> D3D #96387 10/29/06 10:20 10/29/06 10:20
Joined: Jan 2004 Posts: 2,013 The Netherlands E Excessus OP Expert
Excessus OP Expert E Joined: Jan 2004 Posts: 2,013 The Netherlands	I want to convert a point in worldspace in the 3dgs coordinate system to the DirectX/D3D coordinate system (also worldspace). What axes and/or signs do I have to swap? shader tutorial

Re: coordinate system 3DGS -> D3D [Re: Excessus] #96388 10/29/06 12:47 10/29/06 12:47
Joined: Jul 2000 Posts: 27,986 Frankfurt jcl Chief Engineer
jcl Chief Engineer Joined: Jul 2000 Posts: 27,986 Frankfurt	The Y and Z axis. (X Y Z) -> (X Z Y)

Re: coordinate system 3DGS -> D3D [Re: jcl] #96389 10/29/06 13:31 10/29/06 13:31
Joined: Jan 2004 Posts: 2,013 The Netherlands E Excessus OP Expert
Excessus OP Expert E Joined: Jan 2004 Posts: 2,013 The Netherlands	Thank you shader tutorial

Re: coordinate system 3DGS -> D3D [Re: Excessus] #96390 10/29/06 13:54 10/29/06 13:54
Joined: Oct 2003 Posts: 4,131 M Matt_Aufderheide Expert
Matt_Aufderheide Expert M Joined: Oct 2003 Posts: 4,131	This has got to be the most annoying thing about A6. Why cant the the coord system be the same as the D3D internal coords? Sphere Engine--the premier A6 graphics plugin.

Re: coordinate system 3DGS -> D3D [Re: Matt_Aufderheide] #96391 10/30/06 09:49 10/30/06 09:49
Joined: Jul 2000 Posts: 27,986 Frankfurt jcl Chief Engineer
jcl Chief Engineer Joined: Jul 2000 Posts: 27,986 Frankfurt	I've suggested this to Bill, but as we all know, he decided otherwise.

Re: coordinate system 3DGS -> D3D [Re: Matt_Aufderheide] #96392 10/30/06 13:59 10/30/06 13:59
Joined: Mar 2001 Posts: 3,298 Beverly, Massachusetts Rhuarc Expert
Rhuarc Expert Joined: Mar 2001 Posts: 3,298 Beverly, Massachusetts	Quote: This has got to be the most annoying thing about A6. Why cant the the coord system be the same as the D3D internal coords? No [censored]... that's incredibly ass backwards. Especially confusing having to flip them in shaders too... Bah. Screwed me up a hell of a lot moving back to D3D a while ago and wondering why everything was friggin sideways . It teaches hella bad habits. -Rhuarc... recovered from the Y-is-up coordinate syndrome. I no longer post on these forums, keep in touch with me via: Linkedin.com My MSDN blog

Re: coordinate system 3DGS -> D3D [Re: Rhuarc] #96393 10/30/06 14:57 10/30/06 14:57
Joined: Apr 2002 Posts: 4,801 Richmond B.C., Canada Captain_Kiyaku Dichotomic
Captain_Kiyaku Dichotomic Joined: Apr 2002 Posts: 4,801 Richmond B.C., Canada	but i somehow like it more to have Z as height and not as depth. dunno why, i just like it this way more. For example when you control your player, you move in X and Y, thats better than X and Z IMO. My Blog "Tag und Nacht schrei ich mich heiser, Wind weht alle Worte fort, Tag und Nacht schrei ich mein Kr�henwort!" Subway To Sally - Kr�henk�nig

Re: coordinate system 3DGS -> D3D [Re: Captain_Kiyaku] #96394 10/30/06 16:31 10/30/06 16:31
Joined: Sep 2002 Posts: 8,177 Netherlands PHeMoX Senior Expert
PHeMoX Senior Expert Joined: Sep 2002 Posts: 8,177 Netherlands	I agree. It's pretty comfortable having x - y movement and z is vertical movement. Cheers PHeMoX, Innervision Software (c) 1995-2008 For more info visit: Innervision Software

Re: coordinate system 3DGS -> D3D [Re: PHeMoX] #96395 10/30/06 16:41 10/30/06 16:41
Joined: Mar 2001 Posts: 3,298 Beverly, Massachusetts Rhuarc Expert
Rhuarc Expert Joined: Mar 2001 Posts: 3,298 Beverly, Massachusetts	Quote: I agree. It's pretty comfortable having x - y movement and z is vertical movement. Cheers Although, it's technically wrong . (x,y) are coordinates for a 2d plane, which is viewed as the screen; z then represents depth in a (x,y,z) 3d environment represented by a 2d projection. To flip them for different applications really just muds things up a lot. -Rhuarc I no longer post on these forums, keep in touch with me via: Linkedin.com My MSDN blog

Re: coordinate system 3DGS -> D3D [Re: Rhuarc] #96396 10/30/06 17:18 10/30/06 17:18
Joined: Jan 2004 Posts: 2,013 The Netherlands E Excessus OP Expert
Excessus OP Expert E Joined: Jan 2004 Posts: 2,013 The Netherlands	I agree it's annoying, but you can't say it's technically wrong. x,y and z have no meaning by themselves, the choice what to use them for is arbitrary. OpenGL, for example uses a different coordinate system than DirectX does, I believe. I also understand why it won't be changed (neither by Bill nor JCL). As you can see in this very thread, people don't like changing habbits.. shader tutorial

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