Simplify Light::setBrightness/Smooth.

include/engine/Light.hpp

@@ -14,7 +14,7 @@ struct Light {
 
 	/** Sets the brightness immediately with no light decay. */
 	void setBrightness(float brightness) {
-		value = (brightness > 0.f) ? brightness : 0.f;
+		value = brightness;
 	}
 
 	float getBrightness() {
@@ -23,15 +23,14 @@ struct Light {
 
 	/** Emulates light decay with slow fall but immediate rise. */
 	void setSmoothBrightness(float brightness, float deltaTime) {
-		float v = (brightness > 0.f) ? brightness : 0.f;
-		if (v < value) {
+		if (brightness < value) {
 			// Fade out light
 			const float lambda = 30.f;
-			value += (v - value) * lambda * deltaTime;
+			value += (brightness - value) * lambda * deltaTime;
 		}
 		else {
 			// Immediately illuminate light
-			value = v;
+			value = brightness;
 		}
 	}