/// <summary>
/// Search which is the nearby light for the current object.
/// </summary>
/// <returns>The nearby light.</returns>
private LightProperties SearchForNearbyLight()
{
LightProperties nearbyLight = null;
float maxIntensity = 0;
Vector3 objectPosition = this.Matrices.World.Translation;
if (this.renderManager != null)
{
foreach (var light in this.renderManager.Lights)
{
if (light.IsLightEnabled && light.Intensity > 0)
{
float intensity = 0;
if (light is DirectionalLightProperties)
{
intensity = light.Intensity;
}
else
{
Vector3 lightPosition = Vector3.Zero;
float lightRange = 0;
if (light is PointLightProperties)
{
PointLightProperties pointLight = light as PointLightProperties;
lightPosition = pointLight.Position;
lightRange = pointLight.LightRange;
}
else if (light is SpotLightProperties)
{
SpotLightProperties spotLight = light as SpotLightProperties;
lightPosition = spotLight.Position;
lightRange = spotLight.LightRange;
}
float distance = (lightPosition - objectPosition).Length();
if (distance < lightRange)
{
intensity = light.Intensity * (1 - (distance / lightRange));
}
}
intensity *= light.Color.Luminance;
if (intensity > maxIntensity)
{
maxIntensity = intensity;
nearbyLight = light;
}
}
}
}
return(nearbyLight);
}
/// <summary>
/// Sets the parameters.
/// </summary>
/// <param name="cached">if set to <c>true</c> [cached].</param>
public override void SetParameters(bool cached)
{
base.SetParameters(cached);
if (!cached)
{
Camera camera = this.renderManager.CurrentDrawingCamera;
this.shaderParameters.CameraPosition = camera.Position;
this.shaderParameters.ReferenceAlpha = this.ReferenceAlpha;
this.shaderParameters.DiffuseColor = this.diffuseColor;
this.shaderParameters.Alpha = this.Alpha;
this.shaderParameters.AmbientColor = this.ambientColor;
this.shaderParameters.SpecularPower = this.SpecularPower;
this.shaderParameters.SpecularIntensity = this.SpecularIntensity;
this.shaderParameters.TextureOffset = this.TexcoordOffset;
if (this.LightingEnabled)
{
if (this.nearbyLight != null)
{
// Common parameters
this.Light.Color = this.nearbyLight.Color.ToVector3();
this.Light.Intensity = this.nearbyLight.Intensity;
if (this.nearbyLight is DirectionalLightProperties)
{
DirectionalLightProperties directional = this.nearbyLight as DirectionalLightProperties;
this.Light.Direction = directional.Direction;
}
else if (this.nearbyLight is PointLightProperties)
{
PointLightProperties point = this.nearbyLight as PointLightProperties;
this.Light.Position = point.Position;
this.Light.LightRange = point.LightRange;
}
else
{
SpotLightProperties spot = this.nearbyLight as SpotLightProperties;
this.Light.Direction = spot.Direction;
this.Light.LightRange = spot.LightRange;
this.Light.Position = spot.Position;
this.Light.ConeAngle = (float)Math.Cos(spot.LightConeAngle / 2);
}
this.shaderParameters.Light = this.Light;
}
}
this.Parameters = this.shaderParameters;
if (this.diffuse != null)
{
this.graphicsDevice.SetTexture(this.diffuse, 0);
}
if (this.ambient != null)
{
this.graphicsDevice.SetTexture(this.ambient, 1);
}
}
}
