Perspective transformation using Managed DirectX?

DirectX would make you jump through a LOT of hoops to get the result.  You're trying to do a standard quad-based image warp I assume?  There are samples (and likely even examples here on EE) out on the net that I've seen before.

If you REALLY want to go through DirectX, the ROUGH steps you'd need to do are:

- set up a direct3D context (there are some good sample with the DX SDK that start you off with basic rendering)
- load the Image into a D3D Texture object (the D3DX helper functions may help here)
- set up the viewport/camera transformation (in this case, it'll be a display-space camera)
- start rendering
- set the texture as active, and other rendering state
- render a triangle strip or fan with the four vertices in question
- finish rendering
- read pixels out of the backbuffer.

Fun, eh? ;)  As I said, lots of samples with DX SDK that should even start you off with a textured quad and all the proper setup, you just load your image, and need to read from the backbuffer the result.

-d

hmm...

thanks. I was a bit afraid it was going to be that complex. could someone help me find the right sample in the net for "standard quad-based image warp"? points will be rewarded for that.

themos

open source lib:
http://xmorph.sourceforge.net/

image displacement fns:
http://www.codeproject.com/cs/media/DisplacementFilters.asp

this guy's master thesis was on quad image warping, has sample code later on page:
http://www-2.cs.cmu.edu/~ph/

this is different type of approach & effect, but might have useful tidbits:
http://astronomy.swin.edu.au/~pbourke/projection/imagewarp/

-d

hi d,

I really appreciate your effort, it's still though not 100% what I'm looking for. I'm really looking for VB/C# source code, C/C++ is just chinese for me... If you do find a sample in VB/VB.NET or C#, it would be greatly appreciated

thanks
themos

the codeproject.com link WAS C#...

and from http://portal.vbcodesource.com/portal/modules/news/ :
"Finally, Visual Basic 2005 BETA1 is available for download for Non-MSDN subscribers!! I have been playing around with it for alittle while today and I really think I will like it. The .Net Framework 2.0 looks to have even more powerful features available. I was looking through the GDI+ classes and looks like there are some pretty nice change/additions. Looks like warping will be easy to do."

Sounds like from the C# example, and the above note, GDI+ stuff has the capabilities you want.  The codeproject C# sample should get you started for sure.

-d

hi,

the C# project was indeed very interesting, but had no sample related to perspective transformation. The new .NET framework sounds promising, but after browsing the docs I could not find the appropriate function (e.g. new overloaded DrawImage function) that performs warping. If you can find this for me, I'll be more than happy to give you the points.

Thanks
Themos