assets::Skin Struct Reference

A skeleton: the joint nodes a skinned mesh binds to. More...

#include <animation.hpp>

Public Member Functions
auto	jointMatrices (std::span< const glm::mat4 > joint_world_transforms) const -> std::vector< glm::mat4 >
	Builds the per-joint matrices a skinning shader multiplies vertices by.

Public Attributes
std::string	name
std::string	skeleton_root
	node name, empty when glTF didn't specify one
std::vector< std::string >	joints
	node names, in the order joint indices refer to
std::vector< glm::mat4 >	inverse_bind_matrices
	parallel to joints; empty means identity for all

Detailed Description

A skeleton: the joint nodes a skinned mesh binds to.

jointMatrices() turns a posed node tree into the matrices a shader blends between. A mesh whose joints cannot be resolved gets no posed slice and falls back to bind pose rather than dropping

Member Function Documentation

jointMatrices()

auto assets::Skin::jointMatrices ( std::span< const glm::mat4 > joint_world_transforms ) const -> std::vector< glm::mat4 >

nodiscard

Builds the per-joint matrices a skinning shader multiplies vertices by.

joint_world_transform * inverse_bind_matrix, so the product expresses only deformation away from bind - which is what the vertex weights blend between

Parameters

joint_world_transforms

World transforms of joints, same order. A missing entry falls back to identity rather than being skipped, so the result always matches joints.size() and a shader can index it without bounds checks

Note

Supplied by the caller rather than walked here, so several instances can pose one skeleton asset

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The documentation for this struct was generated from the following files:

• engine/src/toast/assets/animation.hpp
• engine/src/toast/assets/animation.cpp