XNA and FBX Coloring Problem
My problem is that, if I use BasicEffect (and setup VertexColorEnabled = true) or my own shader, and use only colored (not textured!) models, it gives the error t开发者_运维知识库hat Color0 is missing...Isn't it weird that .fbx models do not come with COLOR0 channel ?
Here is what I found..... (Marshall Belew @ forums.create.msdn.com/forums/p/16066/553792.aspx#553792) Saved my day...
The solution is simple: the BasicShader has a DiffuseColor property. I merely added a new field into the Toon shader, and any time there was no texture, I substituted the color value.
I am happier with this solution because now I don't have to write a ton of vertex declaration / draw primitive logic.
From the .fx file:
// Pixel shader applies a cartoon shading algorithm.
float4 ToonPixelShader(LightingPixelShaderInput input) : COLOR0
{
float4 color = TextureEnabled ? tex2D(Sampler, input.TextureCoordinate) : DiffuseColor;
Replacing the effects (this is a modified snipet from the NonPhotoRealistic sample).
// Scan over all the effects currently on the mesh.
foreach (BasicEffect oldEffect in mesh.Effects)
{
// If we haven't already seen this effect...
if (!effectMapping.ContainsKey(oldEffect))
{
// Make a clone of our replacement effect. We can't just use
// it directly, because the same effect might need to be
// applied several times to different parts of the model using
// a different texture each time, so we need a fresh copy each
// time we want to set a different texture into it.
Effect newEffect = replacementEffect.Clone(
replacementEffect.GraphicsDevice);
// Copy across the texture from the original effect.
newEffect.Parameters["Texture"].SetValue(oldEffect.Texture);
newEffect.Parameters["TextureEnabled"].SetValue(
oldEffect.TextureEnabled);
Vector4 color = new Vector4(oldEffect.DiffuseColor, 1.0f);
newEffect.Parameters["DiffuseColor"].SetValue(color);
effectMapping.Add(oldEffect, newEffect);
}
}
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