Ok Making A Matrices - How to read it
Author
Hi All,
I am currently writing a flight model and amusing a matrix to determine where the current camera view is.
I can obtain the current location of the camera from the matrix by using (Managed Code)
gMatrix <- A Matrix Object Representing the Camera Matrix
Matrix mInverse = Matrix.Invert(gMatrix);
return mInverse.M41;
Obtains the X Position and so forth for M42 (Y) and M43 (Z)
How though do I obtain the current Rotations, I have read the information in the help and am aware the matrix has different components that represent different aspects of the rotations but is there a way of getting it using somelike like cross or dot product or something.
Basically I just want to have a function where given a input matrix I can obtain the current X,Y,Z rotations (in degrees).
Can anyone help please.
I have to admit, the MDX documentation confuse me - I rarely seem to find the stuff I want in it [smile]. Could well be that I'm a 'native' DX programmer though.
In C/C++ you'd probably want to use D3DXMatrixDecompose(). Given the near 1:1 mapping of native<->managed in recent releases, I'd be expecting you have something similar available to you. Matrix.Decompose() maybe?
hth
Jack
In C/C++ you'd probably want to use D3DXMatrixDecompose(). Given the near 1:1 mapping of native<->managed in recent releases, I'd be expecting you have something similar available to you. Matrix.Decompose() maybe?
hth
Jack
Really doesn't help too much that the online MDX documentation seems to be a bit broken [rolleyes].
Is it just me or http://msdn.microsoft.com/directx/ clicking on the link for managed docs on the RHS takes me to http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_m/directx/directx9m.asp, which is a dead-end?? Nothing I click on there seems to get me into the MDX references [oh]
Jack
Is it just me or http://msdn.microsoft.com/directx/ clicking on the link for managed docs on the RHS takes me to http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_m/directx/directx9m.asp, which is a dead-end?? Nothing I click on there seems to get me into the MDX references [oh]
Jack
Author
I have had a quick look at the docs and also the classes, and I cannot find anything like decompose :(
Thanks anyway for your help :)
Thanks anyway for your help :)
Quote:Original post by MatthewEva
I have had a quick look at the docs and also the classes, and I cannot find anything like decompose :(
Hmm, I'm really hoping that I just suck at navigating the managed documentation (it's somewhat different to the native documentation) but I can't find an equivelent.
The online MSDN stuff might be screwed as far as I can tell (anyone care to verify??) but even on my December-04 SDK release I can't seem to find an equivalent function [oh]
I'll keep looking. This has got me bugged now [smile]
Cheers,
Jack
Author
Im hoping that there is another way to do it.
Basically I have objects in space (hoops) that I need to fly through. These are set in space x,y,z at regulare intervals. However, I need to calculate the angles of the neighbour hoop so that I can rotate it so that it faces the correct way (i.e. in such a manner as a tunnel)
E.g
Hoop1 (x=10,y=10,z=10)
Hoop3( x=50,y=500,z=20)
I need to calculate a parallel angle between Hoop1 & Hoop3 so I know which orientation to put hoop2.
Im hoping this makes sense.
can anyone help please ??
Basically I have objects in space (hoops) that I need to fly through. These are set in space x,y,z at regulare intervals. However, I need to calculate the angles of the neighbour hoop so that I can rotate it so that it faces the correct way (i.e. in such a manner as a tunnel)
E.g
Hoop1 (x=10,y=10,z=10)
Hoop3( x=50,y=500,z=20)
I need to calculate a parallel angle between Hoop1 & Hoop3 so I know which orientation to put hoop2.
Im hoping this makes sense.
can anyone help please ??
Quote:Original post by jollyjeffers
Hmm, I'm really hoping that I just suck at navigating the managed documentation (it's somewhat different to the native documentation) but I can't find an equivelent.
The online MSDN stuff might be screwed as far as I can tell (anyone care to verify??) but even on my December-04 SDK release I can't seem to find an equivalent function [oh]
I'll keep looking. This has got me bugged now [smile]
- The online managed documentation is borked for non-IE browsers. The 'DirectX SDK' sub-entry has a '+' to its left, and should be expandable. It's only expandable in IE, currently. I've reported it. Always use the link at the bottom of each page for comments - There's a "separate" documentation team for DirectX [smile]
- There's no decompose wrapper in managed DirectX as of Summer 2004, I've confirmed it with ildasm.exe (inspect the managed DirectX assemblies). I filed a bug.
Quote:I need to calculate a parallel angle between Hoop1 & Hoop3 so I know which orientation to put hoop2.
Im hoping this makes sense.
can anyone help please ??
Makes sense to me. I did have some code (years ago!) that did this... but I have no idea where it is now.
I suggest you go have a word with the Maths and Physics people - they're bound to be able to tell you the "pure" mathemagic way of solving this [smile]
Quote:Original post by Coder
- The online managed documentation is borked for non-IE browsers. The 'DirectX SDK' sub-entry has a '+' to its left, and should be expandable. It's only expandable in IE, currently. I've reported it. Always use the link at the bottom of each page for comments - There's a "separate" documentation team for DirectX [smile]
Aaaah, makes sense - wouldn't of solved that myself, it's been a long time since I used MSIE for browsing the web. FireFox all the way for me [grin]
Quote:Original post by Coder
- There's no decompose wrapper in managed DirectX as of Summer 2004, I've confirmed it with ildasm.exe (inspect the managed DirectX assemblies). I filed a bug.
Right, best call off the search then [smile]
hth
Jack
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