View motion blending sample source code.
Motion blending extends the concept of animation blending to root motion. It blends the motion resulting from the motion extraction process, which is needed to get the correct motion when animations are blent.
Initializing WebGL
This sample is built on top of the animation blending sample. It blends three animations (walk, jog and run) and their corresponding root motions according to a single “speed” coefficient. See animation blending sample for more details.
It uses motion tracks extracted using *2ozz tools, relying itself on ozz::animation::offline::MotionExtractor. See animation.tracks.motion settings as described in the reference configuration.
At runtime, the motion of each animation is sampled and accumulated. See motion playback sample for more details.
The motion delta for the frame (provided by each accumulator) is used as input to ozz::animation::MotionBlendingJob for blending. Motion blending weights are simply the same weights as animation blending. The resulting blended motion is finally used to update character motion accumulator.
The sample exposes blending parameter as a unique “blend ratio” slider that automatically controls all the other parameters to synchronize all animation layers: playback speeds, blending weights… It’s also possible to manually tweak all the sampling and blending parameters from the GUI, bypassing automatic weighting and synchronization.
An angular velocity is exposed to control the character.
Note that predicted motion is rendered with an alpha transparency that reflects its (blending) weight.
ozz::animation::BlendingJob object. See “blending” sample.ozz::sample::MotionSampler utility. Note that early out isn’t possible, all 3 motions need to be updated to keep motion accumulator relevant.ozz::animation::MotionBlendingJob layers with the delta of motion from each animation, and the same weights as animation’s ones.ozz::animation::MotionDeltaAccumulator utility.