Assimp Skeletal Animation Follies

Douglas · 2012-07-03T12:41:15

I've gone through all of the motions of adding skeletal animation with assimp to my game engine, but it seems I'm not quite generating transforms correctly or something. I have my AssimpImporter.h/cpp source file which reads all of the data and stores it in the data structures in Animation.h/cpp. Basically I store a tree of Bones for the bind pose and each bone knows it's parent and children, as well as it's bind pose offset matrix which I believe are pre-multiplied, but I'm not sure. I also store an "Animation" which has for each bone id a vector of time stamp/transform component pairs. When animating, I pass a timestamp into the animation and it loops through those components for each bone and generates a list of transforms and returns those. Then I take those and for each one multiply up the tree of bones starting with that bone's bind pose matrix. The issue is that my model goes from nicely rendered static model to a mess of data with some unanimated parts blatently showing just fine like my character's head just floats around in the mess of triangles, fully in tact. I've verified by other means that I'm sending in the weight and bone index data property as vertex attributes. Basically I need someone to take a look at the way I'm calculating my bone transforms and double check my math, hopefully given some knowledge of assimp and glm going together. here are links to my github page's code for the relevant files... My Transform Generation is in Here: (Ignore the fact that it prints lots of junk) https://github.com/p...Source/Math.cpp Assimp Loading Code: https://github.com/p...simpInterface.h https://github.com/p...mpInterface.cpp Animation Code: https://github.com/p...ics/Animation.h https://github.com/p...e/Animation.cpp Thanks ahead of time for any insight, as I'm at a loss... If you want any screenshots, do't' hesitate to ask!

Graphics and GPU Programming Programming

Started by Enalis June 29, 2012 06:50 PM

10 comments, last by Enalis 11 years, 9 months ago

larspensjo

1,561

July 02, 2012 08:37 PM

Side note... the code I currently have does not work with the intel hd 3000, which claims to support opengl 3 but appears to be missing some key features.

Same for me! So far, I haven't bothered to find out why, but if you find out, please tell. Though I don't think it has anything to do with the animation.

For me, a call to glDrawArrays(GL_TRIANGLES,...) hangs for ever, never to return.

[size=2]Current project: Ephenation.
[size=2]Sharing OpenGL experiences: http://ephenationopengl.blogspot.com/

Enalis

333

Author

July 03, 2012 12:41 PM

For me, my uniform mat4 array gets corrupted... it's fine on NVdia. Keep in mind, I'm generally always doing development on Linux, but I keep my drivers up to date, and Intel doesn't' seem to have a complete gl3 implementation anywhere for this chip.

Douglas Eugene Reisinger II
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Assimp Skeletal Animation Follies

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Assimp Skeletal Animation Follies

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