How to define vertex declaration in Riemer XNA tutorial.

1

Been working through the updated MonoGame version and I’m getting the error System.NotImplementedException when it runs. After a Google I think the problem is normals and the VertexDeclaration but I’m lost. Can anyone help please?

        RasterizerState rs = new RasterizerState();
        rs.CullMode = CullMode.None;
        rs.FillMode = FillMode.WireFrame;
        device.RasterizerState = rs;

        effect.CurrentTechnique = effect.Techniques["ColoredNoShading"];

        effect.Parameters["xView"].SetValue(viewMatrix);
        effect.Parameters["xProjection"].SetValue(projectionMatrix);
        Matrix worldMatrix = Matrix.Identity;
        effect.Parameters["xWorld"].SetValue(worldMatrix);
        

        foreach (EffectPass pass in effect.CurrentTechnique.Passes)
        {
            pass.Apply();

            device.DrawUserIndexedPrimitives(PrimitiveType.TriangleList, vertices, 0, vertices.Length, indices, 0, indices.Length / 3, VertexPositionColor.VertexDeclaration);
        }
2

It would be useful to know where the exception is happening. You should be able to get a stacktrace.

Does the ColoredNoShading technique need normals? The NoShading part indicates that it doesnt, but if it does, then VertexPositionColor.VertexDeclaration won’t work, because that only includes position and color, no normals.

3

This is how I did it in Riemers Series 3D 3 HLSL overview
(Windows/Visual Studio 2019 Community/XNA 4.0)

namespace XNAseries3
{
public struct MyOwnVertexFormat
{
public Vector3 Position;
private Vector2 TexCoord;
private Vector3 Normal;

    public MyOwnVertexFormat(Vector3 position, Vector2 texCoord, Vector3 normal)
    {
         this.Position = position;
         this.TexCoord = texCoord;
         this.Normal = normal;
    }

    public readonly static VertexDeclaration VertexDeclaration = new VertexDeclaration
    (
        new VertexElement(0, VertexElementFormat.Vector3, VertexElementUsage.Position, 0),
        new VertexElement(sizeof(float) * 3, VertexElementFormat.Vector2, VertexElementUsage.TextureCoordinate, 0),
        new VertexElement(sizeof(float) * (3 + 2), VertexElementFormat.Vector3, VertexElementUsage.Normal, 0)
    );

}
//…

    foreach (EffectPass pass in effect.CurrentTechnique.Passes)
    {
        pass.Apply();
        device.SetVertexBuffer(vertexBuffer);
        device.DrawPrimitives(PrimitiveType.TriangleStrip, 0, MyOwnVertexFormat.VertexDeclaration.VertexStride);
    }

BTW
I would change this:
rs.FillMode = FillMode.WireFrame;
to:
rs.FillMode = FillMode.Solid;

// Here’s an example of IVertexType implementation
public struct VertexPositionNormalTangentBinormalTexture : IVertexType
{
public Vector3 Position;
public Vector3 Normal;
public Vector2 TextureCoordinate;
public Vector3 Tanget;
public Vector3 Binormal;

public static readonly VertexElement[] VertexElements = new VertexElement[] 
{
    new VertexElement(0, VertexElementFormat.Vector3, VertexElementUsage.Position, 0),
    new VertexElement(12, VertexElementFormat.Vector3, VertexElementUsage.Normal, 0),
    new VertexElement(24, VertexElementFormat.Vector2, VertexElementUsage.TextureCoordinate, 0),
    new VertexElement(32, VertexElementFormat.Vector3, VertexElementUsage.Tangent, 0),
    new VertexElement(44, VertexElementFormat.Vector3, VertexElementUsage.Binormal, 0)
};

public static readonly VertexDeclaration MyVertexDeclaration = new VertexDeclaration(VertexElements);

// (enables implementation of IVertexType)
public VertexDeclaration VertexDeclaration
{
    get { return MyVertexDeclaration; }
}

public static readonly int SizeInBytes = sizeof(float) * (3 + 3 + 2 + 3 + 3);

}

// now the custom type can be used:
// typeof(VertexPositionNormalTangentBinormalTexture)