XNA4.0奇怪的颜色错误

Question

我在用XNA绘制地形时遇到了问题，特别是用颜色(这发生在VertexPositionColorNormal和VertexPositionTextureNormal上)。我的代码如下：

public BasicEffect GetEffectForColoredTerrain()
{
    this.coloredTerrainEffect.EnableDefaultLighting();
    this.coloredTerrainEffect.SpecularPower = 0.01f; //Power of the light
    this.coloredTerrainEffect.AmbientLightColor = new Vector3(0.1f, 0.1f, 0.1f); //Color of the light when it reflects on a surface
    this.coloredTerrainEffect.EmissiveColor = new Vector3(1, 0, 0);
    this.coloredTerrainEffect.DirectionalLight0.Enabled = true; //Enable directional light
    this.coloredTerrainEffect.DirectionalLight0.DiffuseColor = (new Vector3(0.2f, 0.2f, 0.2f)); //Diffuse color
    this.coloredTerrainEffect.DirectionalLight0.SpecularColor = (new Vector3(0.2f, 0.2f, 0.2f)); //Specular color
    this.coloredTerrainEffect.DirectionalLight0.Direction = Vector3.Normalize(new Vector3(1, -1f, 1)); //Direction where the light comes from.
    this.coloredTerrainEffect.View = Camera.GetInstance().GetViewMatrix();
    this.coloredTerrainEffect.Projection = Camera.GetInstance().GetProjectionMatrix();
    this.coloredTerrainEffect.Alpha = (float)((float)Configuration.GetInstance().TerrainOpacity / (float)100);
    this.coloredTerrainEffect.VertexColorEnabled = true;

    return this.coloredTerrainEffect;
}

这个绘制地形的代码：

RasterizerState rs = new RasterizerState();
rs.CullMode = CullMode.None;
WorldContent.CommonGraphicsDevice.RasterizerState = rs;
//Restore things that SpriteBatch can have overriden
WorldContent.CommonGraphicsDevice.BlendState = BlendState.AlphaBlend;
WorldContent.CommonGraphicsDevice.DepthStencilState = DepthStencilState.Default;
WorldContent.CommonGraphicsDevice.SamplerStates[0] = SamplerState.LinearClamp;

BasicEffect shader = ShadersHandler.GetInstance().GetEffectForColoredTerrain();
foreach (EffectPass pass in shader.CurrentTechnique.Passes)
{
    pass.Apply();
    WorldContent.CommonGraphicsDevice.Indices = indexBufferVertices;
    WorldContent.CommonGraphicsDevice.SetVertexBuffer(vertexBufferVertices);
    WorldContent.CommonGraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, vertexPositionColorNormalList.Length, 0, indicesVertices.Length / 3);
}

但是，结果确实很奇怪，正如您可以在以下图像中看到的那样：

横向地形

地形底部

颜色是从黄色到白色的渐变(黄色向上，白色向下)。但是，如果我使用Riemers教程中的效果文件( 3D系列1中的effects.fx)，那么一切都是正确的，正如您在这里看到的：

横向地形良好

地形好底

如果您愿意，您可以在这里看到效果代码：效果文件

那么，问题：有人知道BasicEffect在这里发生了什么吗？我想使用Riemers文件(它看起来一切都是正确的)，但是我需要使用透明性，BasicEffect对象提供给我alpha属性，这对于我正在寻找的东西来说是完美的。

PD:同样的问题发生在纹理地形上，使用VertexPositionNormalTexture

Answer 1

看着图像，变色似乎是一个非常好的圆圈，从一个方向的光。我将尝试删除您在DirectionalLight0示例中使用的BasicEffect属性设置，并查看它是否纠正了变色。