var shader1 : Shader;
private var shader2 : Shader;
var particles : ParticleRenderer;

private var currentShader : Shader;

function Start() {
	currentShader = shader1;
	shader2 = Shader.Find("Particles/~Additive-Multiply");
	particles.material.shader = currentShader;
}

function Update() {
	if (Input.GetKeyDown("space")) {
		currentShader = (currentShader==shader1) ? shader2 : shader1;
		particles.material.shader = currentShader;
	}
}