Models created via a script behave unexpectedly with materials that have a normal map

Release Type: Official Release

Version: 3.0.0.8 & 3.1

Platform(s): Windows

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Open Xenko Launcher.
2. Create a new Project - New game. Include the Materials Pack asset pack.
3. Create a new empty entity.
4. Create a new script with the following code:

    using Xenko.Engine;
    using Xenko.Extensions;
    using Xenko.Graphics.GeometricPrimitives;
    using Xenko.Rendering;

    public class MeshScript : SyncScript
    {
        public Material Material
        {
            get;
            set;
        }
            
        // Declared public member fields and properties will show in the game studio

        public override void Start()
        {   
            var meshDraw = GeometricPrimitive.Sphere.New(this.GraphicsDevice).ToMeshDraw();
            var mesh = new Mesh() { Draw = meshDraw };
            
            var model = new Model();
            model.Meshes.Add(mesh);
            model.Materials.Add(this.Material);
            
            var modelComponent = this.Entity.GetOrCreate<ModelComponent>();
            modelComponent.Model = model;
        }

        public override void Update()
        {
            // Do stuff every new frame
        }
    }

1. Add the script to the empty entity.
2. Assign a PBR texture from the pack (such as Materials/brick/brick). Seems to only affect materials with a normal map.
3. Build and run the game.

Expected behavior A sphere to appear in game rendered with the specified material.

Screenshots

Disabling Bright Filter post-processing:

Disabling Surface normal map on brick texture:

Log and callstacks n/a

Additional context Disabling all post-processing removes the black artifacts but the model renders in all black.

ReproProject.zip

[larinius]

Found solution in Blender when exporting FBX files! It’s under the Geometries tab, at the bottom – make sure “Tangent Space” is checked on:

[jeske]

At the very least, the documentation should be updated to correctly explain how to create a sphere that contains tangent data… since right now it advocates using:

var meshDraw = Stride.Graphics.GeometricPrimitives.GeometricPrimitive.Sphere.New(GraphicsDevice).ToMeshDraw();

https://doc.xenko.com/latest/en/manual/scripts/create-a-model-from-code.html