Spherical Skinning with Dual-Quaternions and QTangent - Crytek

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Goal #1• Improve performance by reducing the shaderconstant requirements for joint transformations• Skinned geometry requires multiple passes• Motion Blur requires twice the transformations• The amount of required shader constantsaffects the performance of a single pass
Skinning with Quaternions• ~30% less shader constants consumptioncompared to 4x3 packed matrices• Quaternion Linear Skinning• Accumulated transformations don’t work for positions• Explosion of vertex instructions• Quaternion Spherical Skinning [HEIJL04]• Extra vertex attribute required• Doesn’t handle well more than 2 influences per vertex• Dual-Quaternion Skinning [KCO06] [KCZO08]• Increase in vertex instructions
Page 1 and 2: Spherical Skinning withDual-Quatern
Page 3: Skinned Geometry
Page 7 and 8: From Linear to Spherical• Geometr
Page 9 and 10: Tangent FramesTangent Frames were t
Page 11 and 12: Compressed Matrix FormatVertex attr
Page 13 and 14: Bringing Reflection Into the Equati
Page 15 and 16: Our Quaternion PropertiesThey are n
Page 17 and 18: Tangent Frame Format Memory Compari
Page 19 and 20: Avoiding Quaternion CompressionIsn'
Page 21 and 22: Decoding ReflectionAll we have to d
Page 23 and 24: Tangent Frame Transformation with D
Page 25: Stress-Testing QTangentsBy making s
Page 29 and 30: Singularity Found!At times the most
Page 31 and 32: Floating-Point Standards• So what
Page 33 and 34: Handling Singularities• In order
Page 35 and 36: Applying the Bias ConstantWe need t
Page 37 and 38: QTangents with Static GeometryPosit
Page 39 and 40: Special Thanks• Ivo Herzeg, Micha
Page 41: Questions?ivof@crytek.com

Spherical Skinning with Dual-Quaternions and QTangent - Crytek

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