Method update

game/state/shared/projectile.cpp:74–165

}

void Projectile::update(GameState &state, unsigned int ticks)
{
	// Delay the projectile accordingly
	if (delay_ticks_remaining > ticks)
	{
		delay_ticks_remaining -= ticks;
		return;
	}
	else
	{
		ticks -= delay_ticks_remaining;
		delay_ticks_remaining = 0;
		if (ticks == 0)
		{
			return;
		}
	}

	if (ownerInvulnerableTicks > ticks)
	{
		ownerInvulnerableTicks -= ticks;
	}
	else
	{
		ownerInvulnerableTicks = 0;
	}
	this->previousPosition = this->position;

	// Tracking
	if (turnRate > 0)
	{
		if (trackedObject)
		{
			targetPosition = trackedObject->getVoxelCentrePosition();
		}
		else
		{
			// Stop tracking if arrived
			if ((Vec3<int>)position == (Vec3<int>)targetPosition)
			{
				turnRate = 0;
			}
		}
		auto targetVector = targetPosition - position;
		auto cross = glm::cross(velocity, targetVector);
		// Cross product is 0 if we are moving straight on target
		if (cross.x != 0.0f || cross.y != 0.0f || cross.z != 0.0f)
		{
			float maxAngleToTurn = (float)ticks * turnRate * PROJECTILE_TURN_PER_TICK;
			// angle is always > 0, turning direction determined by cross product
			float angleToTarget =
			    clamp(glm::angle(glm::normalize(velocity), glm::normalize(targetVector)), 0.0f,
			          maxAngleToTurn);
			glm::mat4 rotationMat(1);
			rotationMat = glm::rotate(rotationMat, angleToTarget, cross);
			velocity = glm::vec3(rotationMat * glm::vec4(velocity, 1.0));
		}
	}