graphics - 如何在 XNA 中消除模型上的光/阴影效果？

Question

我正在开发一个小游戏，我会绘制一个具有重复纹理的 field (土地)。我的问题是渲染的结果。这给人的印象是看到我的立方体周围的一切看起来都像是一个光影。是否可以在我的绘图功能中标准化光线或消除阴影效果？

抱歉我的英语不好..

这是一个屏幕截图，可以更好地理解我的问题。

这里是我的代码绘制函数(使用顶点缓冲区实例化模型)

    // Draw Function (instancing model - vertexbuffer)
    public void DrawModelHardwareInstancing(Model model,Texture2D texture, Matrix[] modelBones,
                                     Matrix[] instances, Matrix view, Matrix projection)
    {
        if (instances.Length == 0)
            return;

        // If we have more instances than room in our vertex buffer, grow it to the neccessary size.
        if ((instanceVertexBuffer == null) ||
            (instances.Length > instanceVertexBuffer.VertexCount))
        {
            if (instanceVertexBuffer != null)
                instanceVertexBuffer.Dispose();

            instanceVertexBuffer = new DynamicVertexBuffer(Game.GraphicsDevice, instanceVertexDeclaration,
                                                           instances.Length, BufferUsage.WriteOnly);
        }

        // Transfer the latest instance transform matrices into the instanceVertexBuffer.
        instanceVertexBuffer.SetData(instances, 0, instances.Length, SetDataOptions.Discard);

        foreach (ModelMesh mesh in model.Meshes)
        {
            foreach (ModelMeshPart meshPart in mesh.MeshParts)
            {
                // Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
                Game.GraphicsDevice.SetVertexBuffers(
                    new VertexBufferBinding(meshPart.VertexBuffer, meshPart.VertexOffset, 0),
                    new VertexBufferBinding(instanceVertexBuffer, 0, 1)
                );

                Game.GraphicsDevice.Indices = meshPart.IndexBuffer;


                // Set up the instance rendering effect.
                Effect effect = meshPart.Effect;
                //effect.CurrentTechnique = effect.Techniques["HardwareInstancing"];
                effect.Parameters["World"].SetValue(modelBones[mesh.ParentBone.Index]);
                effect.Parameters["View"].SetValue(view);
                effect.Parameters["Projection"].SetValue(projection);
                effect.Parameters["Texture"].SetValue(texture);


                // Draw all the instance copies in a single call.
                foreach (EffectPass pass in effect.CurrentTechnique.Passes)
                {
                    pass.Apply();

                    Game.GraphicsDevice.DrawInstancedPrimitives(PrimitiveType.TriangleList, 0, 0,
                                                           meshPart.NumVertices, meshPart.StartIndex,
                                                           meshPart.PrimitiveCount, instances.Length);
                }
            }



        }
    }
    // ### END FUNCTION DrawModelHardwareInstancing

Answer 1

问题出在您使用的立方体网格上。法线是平均的，但我猜你希望它们与立方体的面正交。

您总共必须使用 24 个顶点(每边 4 个)而不是 8 个顶点。每个角都有 3 个位置相同但法线不同的顶点，每个相邻面都有一个顶点:

如果 FBX 导出器无法配置为正确导出法线，只需创建您自己的立方体网格:

var vertices = new VertexPositionNormalTexture[24];

// Initialize the vertices, set position and texture coordinates
// ...

// Set normals

// front face
vertices[0].Normal = new Vector3(1, 0, 0);
vertices[1].Normal = new Vector3(1, 0, 0);
vertices[2].Normal = new Vector3(1, 0, 0);
vertices[3].Normal = new Vector3(1, 0, 0);

// back face
vertices[4].Normal = new Vector3(-1, 0, 0);
vertices[5].Normal = new Vector3(-1, 0, 0);
vertices[6].Normal = new Vector3(-1, 0, 0);
vertices[7].Normal = new Vector3(-1, 0, 0);

// ...