VR-Mess/scripts/PropShop.cs

using Godot;

public partial class PropShop : Node3D
{
    private struct PropSpec
    {
        public string Name;
        public float Radius;
        public Vector3 Box;
        public float Mass;
        public float Bounce;
        public float Friction;
        public Color Color;
        public Vector3 Position;
    }

    private static readonly PropSpec[] Specs =
    {
        new() { Name = "Ping pong · 2.7 g", Radius = 0.02f, Mass = 0.0027f, Bounce = 0.9f, Friction = 0.3f, Color = new(1f, 1f, 1f), Position = new(-0.5f, 0.78f, -0.55f) },
        new() { Name = "Bouncy ball · 50 g", Radius = 0.03f, Mass = 0.05f, Bounce = 0.85f, Friction = 0.4f, Color = new(1f, 0.4f, 0.7f), Position = new(-0.3f, 0.79f, -0.45f) },
        new() { Name = "Apple · 150 g", Radius = 0.045f, Mass = 0.15f, Bounce = 0.3f, Friction = 0.6f, Color = new(0.85f, 0.15f, 0.1f), Position = new(-0.08f, 0.81f, -0.55f) },
        new() { Name = "Crate · 2 kg", Box = new(0.16f, 0.16f, 0.16f), Mass = 2f, Bounce = 0.1f, Friction = 0.8f, Color = new(0.7f, 0.5f, 0.25f), Position = new(0.18f, 0.84f, -0.5f) },
        new() { Name = "Brick · 3.5 kg", Box = new(0.2f, 0.06f, 0.095f), Mass = 3.5f, Bounce = 0.05f, Friction = 0.9f, Color = new(0.6f, 0.3f, 0.2f), Position = new(-0.32f, 0.79f, -0.25f) },
        new() { Name = "Bowling ball · 7.2 kg", Radius = 0.11f, Mass = 7.2f, Bounce = 0.1f, Friction = 0.5f, Color = new(0.1f, 0.2f, 0.5f), Position = new(0.05f, 0.87f, -0.25f) },
        new() { Name = "Anvil · 50 kg", Box = new(0.28f, 0.16f, 0.13f), Mass = 50f, Bounce = 0f, Friction = 0.95f, Color = new(0.25f, 0.25f, 0.28f), Position = new(0.38f, 0.84f, -0.35f) },
    };

    public override void _Ready()
    {
        BuildTable();
        foreach (PropSpec spec in Specs)
            SpawnProp(spec);
    }

    public void Respawn()
    {
        // Only the table's own props (the playground's dynamic pieces are props too — they reset
        // in place via Playground.Reset).
        foreach (Node node in GetChildren())
            if (node is RigidBody3D && node.IsInGroup("prop"))
                node.QueueFree();
        foreach (PropSpec spec in Specs)
            SpawnProp(spec);
        GD.Print("PropShop: table reset");
    }

    private void BuildTable()
    {
        Color wood = new(0.45f, 0.3f, 0.18f);
        StaticBody3D table = new();
        table.CollisionMask = 0b11101;  // world + player body + hands + arms
        table.AddChild(new CollisionShape3D
        {
            Position = new Vector3(0, 0.725f, -0.6f),
            Shape = new BoxShape3D { Size = new Vector3(1.4f, 0.05f, 0.8f) },
        });
        MeshInstance3D top = new()
        {
            Position = new Vector3(0, 0.725f, -0.6f),
            Mesh = new BoxMesh { Size = new Vector3(1.4f, 0.05f, 0.8f) },
        };
        top.SetSurfaceOverrideMaterial(0, MakeMaterial(wood));
        table.AddChild(top);

        Vector3[] legOffsets =
        {
            new(-0.62f, 0, 0.32f),
            new(0.62f, 0, 0.32f),
            new(-0.62f, 0, -0.32f),
            new(0.62f, 0, -0.32f),
        };
        foreach (Vector3 offset in legOffsets)
        {
            Vector3 pos = new(offset.X, 0.3625f, -0.6f + offset.Z);
            table.AddChild(new CollisionShape3D
            {
                Position = pos,
                Shape = new BoxShape3D { Size = new Vector3(0.06f, 0.725f, 0.06f) },
            });
            MeshInstance3D leg = new()
            {
                Position = pos,
                Mesh = new BoxMesh { Size = new Vector3(0.06f, 0.725f, 0.06f) },
            };
            leg.SetSurfaceOverrideMaterial(0, MakeMaterial(wood * 0.8f));
            table.AddChild(leg);
        }
        AddChild(table);
    }

    private void SpawnProp(PropSpec spec)
    {
        RigidBody3D body = new()
        {
            Name = spec.Name,
            Mass = spec.Mass,
            Position = spec.Position,
            PhysicsMaterialOverride = new PhysicsMaterial { Bounce = spec.Bounce, Friction = spec.Friction },
            ContinuousCd = spec.Mass < 0.1f,
            ContactMonitor = true,
            MaxContactsReported = 4,
            CollisionMask = 0b11101,  // world + player body + hands + arms
        };
        body.AddToGroup("prop");

        if (spec.Radius > 0f)
        {
            body.AddChild(new CollisionShape3D { Shape = new SphereShape3D { Radius = spec.Radius } });
            MeshInstance3D mesh = new()
            {
                Mesh = new SphereMesh { Radius = spec.Radius, Height = spec.Radius * 2f },
            };
            mesh.SetSurfaceOverrideMaterial(0, MakeMaterial(spec.Color));
            body.AddChild(mesh);
        }
        else
        {
            body.AddChild(new CollisionShape3D { Shape = new BoxShape3D { Size = spec.Box } });
            MeshInstance3D mesh = new()
            {
                Mesh = new BoxMesh { Size = spec.Box },
            };
            mesh.SetSurfaceOverrideMaterial(0, MakeMaterial(spec.Color));
            body.AddChild(mesh);
        }

        float halfHeight = spec.Radius > 0f ? spec.Radius : spec.Box.Y * 0.5f;
        body.AddChild(new Label3D
        {
            Text = spec.Name,
            FontSize = 64,
            PixelSize = 0.0004f,
            OutlineSize = 8,
            Billboard = BaseMaterial3D.BillboardModeEnum.Enabled,
            Position = new Vector3(0, halfHeight + 0.1f, 0),
        });

        AddChild(body);
    }

    private static StandardMaterial3D MakeMaterial(Color color) => new()
    {
        AlbedoColor = color,
        Roughness = 0.7f,
    };
}