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Here’s a comprehensive explanation of (also known as blend shape animation or vertex morphing ). What Is Morph Target Animation? Morph target animation is a technique for deforming a 3D mesh by interpolating between different pre-defined sets of vertex positions (called morph targets or blend shapes ).
In practice, games often use + morphs for face (e.g., Unreal Engine's Morph Targets, Unity's Blend Shapes). Implementation Sketch (GPU) Vertex shader pseudo-code:
// Input: base position and N target delta vectors vec3 finalPos = basePosition; for (int i = 0; i < numActiveTargets; i++) finalPos += weight[i] * delta[i];