luanti/irr/src/CBoneSceneNode.h

// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#pragma once

// Used with SkinnedMesh and IAnimatedMeshSceneNode, for boned meshes

#include "IBoneSceneNode.h"
#include "Transform.h"
#include "matrix4.h"

#include <optional>

namespace scene
{

class CBoneSceneNode : public IBoneSceneNode
{
public:
	//! constructor
	CBoneSceneNode(ISceneNode *parent, ISceneManager *mgr,
			s32 id = -1, u32 boneIndex = 0,
			const std::optional<std::string> &boneName = std::nullopt,
			const core::Transform &transform = {},
			const std::optional<core::matrix4> &matrix = std::nullopt) :
		IBoneSceneNode(parent, mgr, id, boneIndex, boneName),
		Matrix(matrix)
	{
		setTransform(transform);
	}

	void setTransform(const core::Transform &transform)
	{
		setPosition(transform.translation);
		{
			core::vector3df euler;
			auto rot = transform.rotation;
			// Invert to be consistent with setRotationDegrees
			rot.makeInverse();
			rot.toEuler(euler);
			setRotation(euler * core::RADTODEG);
		}
		setScale(transform.scale);
	}

	core::Transform getTransform() const
	{
		return {
			getPosition(),
			core::quaternion(getRotation() * core::DEGTORAD).makeInverse(),
			getScale()
		};
	}

	core::matrix4 getRelativeTransformation() const override
	{
		if (Matrix)
			return *Matrix;
		return IBoneSceneNode::getRelativeTransformation();
	}

	//! Some file formats alternatively let bones specify a transformation matrix.
	//! If this is set, it overrides the TRS properties.
	std::optional<core::matrix4> Matrix;
};

} // end namespace scene