/// <summary>
/// Cast shadow.(Prepare shadow mapping texture)
/// </summary>
/// <param name="param"></param>
public override void Act(ActionParams param)
{
Scene scene = this.scene;
// Render ambient color.
{
var arg = new ShadowMappingAmbientEventArgs(param, scene.Camera, scene.AmbientColor);
RenderAmbientColor(scene.RootNode, arg);
}
foreach (var light in scene.Lights)
{
if (light is SpotLight || light is DirectionalLight)
{
LightTheScene(light, scene, param);
}
else if (light is PointLight)
{
var xLight = new TSpotLight(light.Position, TSpotLightDirection.X, light.Attenuation)
{
Diffuse = light.Diffuse, Specular = light.Specular,
};
var nxLight = new TSpotLight(light.Position, TSpotLightDirection.NX, light.Attenuation)
{
Diffuse = light.Diffuse, Specular = light.Specular,
};
var yLight = new TSpotLight(light.Position, TSpotLightDirection.Y, light.Attenuation)
{
Diffuse = light.Diffuse, Specular = light.Specular,
};
var nyLight = new TSpotLight(light.Position, TSpotLightDirection.NY, light.Attenuation)
{
Diffuse = light.Diffuse, Specular = light.Specular,
};
var zLight = new TSpotLight(light.Position, TSpotLightDirection.Z, light.Attenuation)
{
Diffuse = light.Diffuse, Specular = light.Specular,
};
var nzLight = new TSpotLight(light.Position, TSpotLightDirection.NZ, light.Attenuation)
{
Diffuse = light.Diffuse, Specular = light.Specular,
};
var lights = new TSpotLight[] { xLight, nxLight, yLight, nyLight, zLight, nzLight };
foreach (var item in lights)
{
LightTheScene(item, scene, param);
}
}
else
{
throw new Exception(string.Format("Unexpected light type:{0}", light.GetType().FullName));
}
}
}
private void RenderAmbientColor(SceneNodeBase sceneNodeBase, ShadowMappingAmbientEventArgs arg)
{
if (sceneNodeBase != null)
{
var node = sceneNodeBase as ISupportShadowMapping;
TwoFlags flags = (node != null) ? node.EnableShadowMapping : TwoFlags.None;
bool before = (node != null) && ((flags & TwoFlags.BeforeChildren) == TwoFlags.BeforeChildren);
bool children = (node == null) || ((flags & TwoFlags.Children) == TwoFlags.Children);
if (before)
{
node.RenderAmbientColor(arg);
}
if (children)
{
foreach (var item in sceneNodeBase.Children)
{
RenderAmbientColor(item, arg);
}
}
}
}
