LadderBlock.cs

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using Engine;
using Engine.Graphics;
 
namespace Game {
    public abstract class LadderBlock : Block {
        public string m_modelName;
 
        public float m_offset;
 
        public BlockMesh m_standaloneBlockMesh = new();
 
        public BlockMesh[] m_blockMeshesByData = new BlockMesh[4];
 
        public BoundingBox[][] m_collisionBoxesByData = new BoundingBox[4][];
 
        public LadderBlock(string modelName, float offset) {
            m_modelName = modelName;
            m_offset = offset;
        }
 
        public override void Initialize() {
            Model model = ContentManager.Get<Model>(m_modelName);
            Matrix boneAbsoluteTransform = BlockMesh.GetBoneAbsoluteTransform(model.FindMesh("Ladder").ParentBone);
            for (int i = 0; i < 4; i++) {
                m_blockMeshesByData[i] = new BlockMesh();
                Matrix m = Matrix.CreateTranslation(0f, 0f, 0f - (0.5f - m_offset))
                    * Matrix.CreateRotationY(i * (float)Math.PI / 2f)
                    * Matrix.CreateTranslation(0.5f, 0f, 0.5f);
                m_blockMeshesByData[i]
                    .AppendModelMeshPart(
                        model.FindMesh("Ladder").MeshParts[0],
                        boneAbsoluteTransform * m,
                        false,
                        false,
                        false,
                        false,
                        Color.White
                    );
                m_blockMeshesByData[i].GenerateSidesData();
                m_collisionBoxesByData[i] = [m_blockMeshesByData[i].CalculateBoundingBox()];
            }
            m_standaloneBlockMesh.AppendModelMeshPart(
                model.FindMesh("Ladder").MeshParts[0],
                boneAbsoluteTransform * Matrix.CreateTranslation(0f, -0.5f, 0f),
                false,
                false,
                false,
                false,
                Color.White
            );
            base.Initialize();
        }
 
        public override void GenerateTerrainVertices(BlockGeometryGenerator generator, TerrainGeometry geometry, int value, int x, int y, int z) {
            int num = Terrain.ExtractData(value);
            if (num < m_blockMeshesByData.Length) {
                generator.GenerateMeshVertices(
                    this,
                    x,
                    y,
                    z,
                    m_blockMeshesByData[num],
                    Color.White,
                    null,
                    geometry.SubsetOpaque
                );
            }
        }
 
        public override void DrawBlock(PrimitivesRenderer3D primitivesRenderer,
            int value,
            Color color,
            float size,
            ref Matrix matrix,
            DrawBlockEnvironmentData environmentData) {
            BlocksManager.DrawMeshBlock(primitivesRenderer, m_standaloneBlockMesh, color, size, ref matrix, environmentData);
        }
 
        public override BlockPlacementData GetPlacementValue(SubsystemTerrain subsystemTerrain,
            ComponentMiner componentMiner,
            int value,
            TerrainRaycastResult raycastResult) {
            BlockPlacementData result = default;
            result.Value = raycastResult.CellFace.Face < 4 ? Terrain.MakeBlockValue(BlockIndex, 0, SetFace(0, raycastResult.CellFace.Face)) : 0;
            result.CellFace = raycastResult.CellFace;
            return result;
        }
 
        public override BoundingBox[] GetCustomCollisionBoxes(SubsystemTerrain terrain, int value) {
            int num = Terrain.ExtractData(value);
            if (num < m_collisionBoxesByData.Length) {
                return m_collisionBoxesByData[num];
            }
            return base.GetCustomCollisionBoxes(terrain, value);
        }
 
        public static int GetFace(int data) => data & 3;
 
        public static int SetFace(int data, int face) => (data & -4) | (face & 3);
 
        public override bool IsMovableByPiston(int value, int pistonFace, int y, out bool isEnd) {
            isEnd = true;
            int data = Terrain.ExtractData(value);
            return pistonFace == GetFace(data);
        }
    }
}