VRM-1.0 Changes

Changes from VRM-0.X

• glTF: z- forward => z+ forward

• glTF: shared bufferView => divided bufferView

• VRM0: meta => VRMC_vrm meta

• VRM0: humanoid => VRMC_vrm humanoid

• VRM0: blendshape => VRMC_vrm expression

• VRM0: lookat => VRMC_vrm lookat

• VRM0: firstperson => VRMC_vrm firstperson

• VRM0: springBone => VRMC_springBone

• new addition => VRMC_materials_hdr_emissiveMultiplier

• VRM0: mtoon => VRMC_materials_mtoon

• new addition => VRMC_node_constraint

glTF: z+ forward

The model stores the Z+ direction forward.

	VRM0	VRM1
forward	z-	z+
right	x+	x-

implementation

Y-axis 180-degree rotation.

Vector3 vrm0;
var vrm1 = new Vector3(-vrm0.x, vrm0.y, -vrm0.z);

TODO

glTF: divided vertex buffer

Stop sharing bufferView between primitives.

	VRM0	VRM1
bufferView	shared	divided
Pros	Less conversions due to close to GameEngine memory	Compatible with generic glTF loaders
Cons	Non-UniVRM glTF loaders can cause memory usage to explode (can be loaded but unused space in the vertex buffer)	There can be an increase in vertices and a change in order at export. Effort to concatenated during import. Clutter handling morphTarget

implementation

Stop the ‘Vrm’ dedicated shared vertex loader and use the general ‘glTF’ loader.

VRMC_vrm: meta

TODO

VRMC_vrm: humanoid

Review of required bones.

	VRM0	VRM1
neck	required
head	required	required
hips	required	required
spine	required	required
chest	required
left/right UpperArm	required	required
left/right LowerArm	required	required
left/right Hand	required	required
left/right UpperLeg	required	required
left/right LowerLeg	required	required
left/right Foot	required	required

The following items will be removed (recorded in ‘VRMHumanoidDescription’):

• armStretch

• legStretch

• upperArmTwist

• lowerArmTwist

• upperLegTwist

• lowerLegTwist

• feetSpacing

• hasTranslationDoF

VRMC_vrm: expression

Rename BlendShape to Expression.

BlendShape

BlendShape is Unity’s MorphTarget feature, which is confusing.

Review of expression preset.

	VRM0	VRM1
喜	joy(joy and fun are ambiguous)	happy
怒	angry	angry
哀	sorrow	sad
楽	fun(joy and fun are ambiguous)	relaxed
驚	(new addition)	surprised
あ	a(Changed to be natural in non-Japanese)	aa
い	i(Changed to be natural in non-Japanese)	ih
う	u(Changed to be natural in non-Japanese)	ou
え	e(Changed to be natural in non-Japanese)	ee
お	o(Changed to be natural in non-Japanese)	oh

• Add overrideMouse, overrideLipSync and overrideBlink.

• Separate VRM0 materialBind from MaterialColorBind and TextureTransformBind.

VRMC_vrm: lookat

• Remove degreemap.curve.

VRMC_vrm: firstperson

• Remove firstPersonBone and fixed to Head.

• firstPersonBoneOffset is changed to lookAt.offsetFromHeadBone.

VRMC_springBone

	VRM0	VRM1
configuration unit	Spring	Joint
child	children[0]	One of children
leaf	Automatically add 7cm distance	Not add

• Separate to independent extension VRMC_springBone

• Add capsule shape to collider.

• Fixed mixing of Unity coordinate systems.

VRMC_materials_hdr_emissiveMultiplier

In glTF, the emissiveFactor(float3) value range is [0.0, 1.0].

Add a factor to this so that it can represent values beyond 1.0.

	VRM0	VRM1
mtoon の emissiveFactor	stored in extension (0, 1 no limit)	material’s emissiveFactor(The range is limited to 0, 1)

Available from gltf-2.0 standard materials (PBR), VRMC_materials_mtoon.

VRMC_materials_mtoon

• Separate to independent extension VRMC_materials_mtoon.

TODO

VRMC_node_constraint

in development

translation

rotation

aim