The type of visual blending style to apply to the particles.

Enumerator:

NORMAL	No blending style.
ADDITIVE	Adds the color of the pixel to the frame buffer with full alpha for each pixel.
SUBTRACTIVE	Subtractive Blending. Reverses the color model, causing dark colors to have a stronger visual effect.
PREMULTALPHA	Color blends with the colors of the imagemap rather than the alpha.

Calculates how much an explosion effects a specific object.

Use this to determine how much damage to apply to objects based on their distance from the explosion's center point, and whether the explosion is blocked by other objects.

Parameters:

	pos	Center position of the explosion.
	id	Id of the object of which to check coverage.
	covMask	Mask of object types that may block the explosion.

Returns:

Coverage value from 0 (not affected by the explosion) to 1 (fully affected)

Example:

// Get the position of the explosion.
%position = %explosion.getPosition();

// Set a list of TypeMasks (defined in gameFunctioncs.cpp), seperated by the | character.
%TypeMasks = $TypeMasks::StaticObjectType | $TypeMasks::ItemObjectType

// Acquire the damage value from 0.0f - 1.0f.
%coverage = calcExplosionCoverage( %position, %sceneObject, %TypeMasks );

// Apply damage to object
%sceneObject.applyDamage( %coverage * 20 );