Irrlicht Engine

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		while (tracks.hasMoreElements())   // for every node track...
		{
			NodeAnimationTrack* track = tracks.getNext();

			// get the keyframe at the chopping point
			TransformKeyFrame oldKf(0, 0);
			track->getInterpolatedKeyFrame(ANIM_CHOP, &oldKf);

			// drop all keyframes after the chopping point
			while (track->getKeyFrame(track->getNumKeyFrames()-1)->getTime() >= ANIM_CHOP - 0.3f)
				track->removeKeyFrame(track->getNumKeyFrames()-1);

			// create a new keyframe at chopping point, and get the first keyframe
			TransformKeyFrame* newKf = track->createNodeKeyFrame(ANIM_CHOP);
			TransformKeyFrame* startKf = track->getNodeKeyFrame(0);

			Bone* bone = skel->getBone(track->getHandle());

			if (bone->getName() == "Spineroot")   // adjust spine root relative to new location
			{
				mSneakStartPos = startKf->getTranslate() + bone->getInitialPosition();
				mSneakEndPos = oldKf.getTranslate() + bone->getInitialPosition();
				mSneakStartPos.y = mSneakEndPos.y;

				newKf->setTranslate(oldKf.getTranslate());
				newKf->setRotation(oldKf.getRotation());
				newKf->setScale(oldKf.getScale());
			}
			else   // make all other bones loop back
			{
				newKf->setTranslate(startKf->getTranslate());
				newKf->setRotation(startKf->getRotation());
				newKf->setScale(startKf->getScale());
			}
		}

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When using shadows (See section 7. Shadows), the use of vertex programs can add some additional complexities, because Ogre can only automatically deal with everything when using the fixed-function pipeline. If you use vertex programs, and you are also using shadows, you may need to make some adjustments.

If you use stencil shadows, then any vertex programs which do vertex deformation can be a problem, because stencil shadows are calculated on the CPU, which does not have access to the modified vertices. If the vertex program is doing standard skeletal animation, this is ok (see section above) because Ogre knows how to replicate the effect in software, but any other vertex deformation cannot be replicated, and you will either have to accept that the shadow will not reflect this deformation, or you should turn off shadows for that object.

If you use texture shadows, then vertex deformation is acceptable; however, when rendering the object into the shadow texture (the shadow caster pass), the shadow has to be rendered in a solid colour (linked to the ambient colour). You must therefore provide an alternative vertex program, so Ogre provides you with a way of specifying one to use when rendering the caster. Basically you link an alternative vertex program, using exactly the same syntax as the original vertex program link: