using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TransformVertexNode : MeshProcessor
{
    public Vector3 Offset = Vector3.zero;
    public Quaternion Rotation = Quaternion.identity;
    public Vector3 Scale = Vector3.one;

    public override void Execute(ProceduralMeshData m){
        var transform = Matrix4x4.TRS(Offset, Rotation, Scale);
        int count = m.Vertices.Length;
        for (int i = 0; i < count; ++i){
            m.Vertices[i] = transform.MultiplyPoint3x4(m.Vertices[i]);
        }

        var normalTransform = Matrix4x4.TRS(Vector3.zero, Rotation, Scale).inverse.transpose;

        for (int i = 0; i < count; ++i) {
            m.Normals[i] = normalTransform.MultiplyPoint3x4(m.Normals[i]);
        }

        if (m.Tangents != null)
        {
            for (int i = 0; i < count; ++i)
            {
                var t = normalTransform.MultiplyPoint3x4((Vector3)m.Tangents[i]);
                m.Tangents[i] = new Vector4(t.x, t.y, t.z, m.Tangents[i].w);
            }
        }
        
    }
}