Quote:

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rot. a = torque / I, or
torque = I*(rot. a)

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Quote:

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(would you still call it velocity when it is rotational?).

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var test_var;
var test_var2;

var force[3];
var temp_force[3];
var moment_of_inertia;
var torque[3];
var rot_a[3];
var distance_from_centre;
var angular_force[3];
var dot_product;

function collision_event()
{

		if( (event_type == event_entity) && my.push >= you.push)
		{
			

//				spaceship_event_hit+=1;
//				if(spaceship_event_hit == 1)
//				{
					
					//calculate the impact force
					//force = mass * velocity
					force = my.mass * vec_length(my.velocity);
					
					//adjust that by the angle of the strike
					//compare the struck surface normal to the direction traveling
					//start with the dot product of the two vectors
					vec_set(temp, NORMAL);
					vec_set(temp2, my.DRIFT_VECTOR);
					if(temp || temp2) //no dividing by zero
					{
						dot_product = acos(vec_dot(temp.x,temp2.x)/(vec_length(temp.x)*vec_length(temp2.x)));
					}
					
					//for collision with stationary objects
					force = force * (cos(180 - dot_product));
					
					
					test_var = force;
					
					
				//linear change	
						//make it bounce
						vec_to_angle(temp,bounce);
						temp2.x = vec_length(my.velocity);
						temp2.y = 0;
						temp2.z = 0;
					
						vec_scale(temp2,0.6); //bouncyness 
					
					
						vec_rotate(temp2,temp);
						vec_set(my.drift_vector,temp2);


//********THIS IS THE DIFFICULT BIT************************************************************************		
				//we also want it to change angular velocity
				//check position of strike against velocity
				
				//for collision with stationary objects
				
				//(moment of inertia) I = kg * m^2
				moment_of_inertia = my.mass * pow(my.diameter,2);
				
				//distance_from_centre
				vec_diff(temp, my.x, target);
				distance_from_centre = vec_length(temp);
				
				//Force
				vec_set(temp, my.velocity);
				vec_scale(temp, my.mass);
				vec_set(force, temp);
				
				
							
				//torque = force * distance_from_centre;
				
				vec_set(temp, force);
				vec_scale(temp, distance_from_centre);
				vec_set(torque,temp);
				
				
				
				//rot. a = torque / I, or
				//torque = I*(rot. a)				
				
				//rot_a = torque/moment_of_inertia
				
				if(moment_of_inertia) //don't divide by zero
				{
					rot_a.pan = torque.pan / moment_of_inertia;
					rot_a.tilt = torque.tilt / moment_of_inertia;
					rot_a.roll = torque.roll / moment_of_inertia;
				}
				
				
				//convert from radians to degrees
				vec_set(temp,rot_a);
				vec_scale(temp, 57.296);
				vec_set(angular_force,temp);
				

				
				//angular_momentum_change = your_angular_formula * sin(theta)
				vec_scale(angular_force, sin(180 - dot_product));
				
				//phew! Now add that to the ship's angular velocity
				vec_add(my.ROT_VELOCITY, angular_force);
				
				
				

//			}
		}