3d-spatial

3D Spatial Animation

Apply Disney's 12 animation principles to 3D software, VR/AR, and spatial computing environments.

Quick Reference

Principle	3D/Spatial Implementation
Squash & Stretch	Lattice deformers, blend shapes
Anticipation	IK/FK wind-ups, camera pre-motion
Staging	Camera angles, lighting, depth
Straight Ahead / Pose to Pose	Layered animation vs blocking
Follow Through / Overlapping	Bone chains, physics simulation
Slow In / Slow Out	F-curve editing, animation curves
Arc	IK handles, motion paths in 3D space
Secondary Action	Cloth sim, particle systems, environment
Timing	Frame timing, VR 90fps requirements
Exaggeration	Stylized deformation, pushed poses
Solid Drawing	Volume preservation, silhouettes
Appeal	Character design, satisfying motion

Principle Applications

Squash & Stretch: Use lattice or mesh deformers for organic squash. Blend shapes for facial deformation. Scale bones in hierarchies. Always preserve volume—if Y compresses, X/Z expand.

Anticipation: IK rig wind-ups for character animation. Camera pulls back before push-in. Objects coil before release. VR: telegraph actions clearly for user comfort.

Staging: Camera angle sells the action. Three-point lighting directs focus. Depth of field isolates subjects. In VR, use spatial audio and lighting to guide attention.

Straight Ahead vs Pose to Pose: Block key poses first (pose to pose), then refine (spline). Use layered animation—body first, then overlapping elements. Procedural secondary motion is straight ahead.

Follow Through & Overlapping: Bone chains for tails, hair, capes. Physics simulation for cloth and particles. Delay child bones from parents. Jiggle deformers for organic follow-through.

Slow In / Slow Out: F-curves (Blender), Animation Curves (Unity), Graph Editor (Maya). Tangent handles control easing. Flat tangents = slow, steep = fast. Never leave curves linear.

Arc: Motion paths visible in 3D space. IK handles naturally create arcs. Check arcs from multiple camera angles. FK rotation creates inherent arcs in hierarchies.

Secondary Action: Cloth simulation responds to primary motion. Particles emit on impacts. Environment objects react to character. Facial animation supports body action.

Timing: Film: 24fps with motion blur. Games: 60fps minimum. VR: 90fps required (72-120fps). Frame timing affects perceived weight—heavy = slower, light = faster.

Exaggeration: Push poses beyond anatomical limits for style. Smear frames for fast motion. Exaggerated anticipation and follow-through. VR: be careful—exaggeration can cause discomfort.

Solid Drawing: Check silhouettes from all angles. Maintain volume during deformation. Strong poses read in profile. Avoid interpenetration and broken geometry.

Appeal: Character design serves animation needs. Weight and balance feel believable. Movement has personality. In VR, presence and comfort are paramount.

Software Techniques

Blender

# Add follow-through with driver
# On child bone, add driver to rotation
driver.expression = "var * 0.3"
driver.variables["var"].source = parent_bone.rotation

# Physics-based secondary
bpy.ops.object.modifier_add(type='CLOTH')
bpy.context.object.modifiers["Cloth"].settings.quality = 10

Unity

// Spring-based follow through
public class SpringFollow : MonoBehaviour {
    public Transform target;
    public float springStrength = 10f;
    public float damping = 0.5f;

    private Vector3 velocity;

    void Update() {
        Vector3 delta = target.position - transform.position;
        velocity += delta * springStrength * Time.deltaTime;
        velocity *= 1f - damping * Time.deltaTime;
        transform.position += velocity * Time.deltaTime;
    }
}

VR/AR Considerations

Aspect	Requirement
Framerate	90fps minimum, 120fps preferred
Motion	Avoid camera animation—user controls view
Comfort	Gradual acceleration, avoid sudden motion
Scale	Animations must work at world scale
Interaction	Clear feedback for hand/controller input

Performance Notes

• LOD (Level of Detail) for distant animations
• Bake complex simulations when possible
• GPU skinning for character meshes
• Culling animations outside view frustum
• VR: maintain framerate above all else