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ft:planets:gravity

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ft:planets:gravity [2015/04/26 22:05] – samft:planets:gravity [2015/04/27 18:05] (current) – sam
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   - Apply the gravitational acceleration to the movement counter in the same direction as in step 2.   - Apply the gravitational acceleration to the movement counter in the same direction as in step 2.
   - Move the ship as normal.   - Move the ship as normal.
 +
 +==== Movement Example ====
 +
 +=== Step One: Work out gravitational force ===
  
 As an example, consider the NAC ship //Aggressor// that is performing a flyby of the Earth. At the start of its movement it is within 3" of the Earth, moving at a velocity of 8" mostly parallel to its surface. As an example, consider the NAC ship //Aggressor// that is performing a flyby of the Earth. At the start of its movement it is within 3" of the Earth, moving at a velocity of 8" mostly parallel to its surface.
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 {{ :ft:gravity_1.png?nolink |}} {{ :ft:gravity_1.png?nolink |}}
  
-According to the table above, the ship is in 4" zone, so will have a gravitational thrust of 4 applied to it. At no point during this example will the //Aggressor// use its own drives - all movement changes will be entirely due to the Earth.+Since the //Aggressor// is in the 2"-4" zone, the gravitational force on it applies a thrust of 4. At no point during this example will the //Aggressor// use its own drives - all movement changes will be entirely due to the Earth. 
 + 
 +=== Step Two: Work out direction of force === 
 + 
 +We next work out which direction the force of gravity applies. This is always in the direction from the ship's starting location towards the centre of the planet.
  
 {{ :ft:gravity_2.png?nolink |}} {{ :ft:gravity_2.png?nolink |}}
  
-We find the vector from the //Aggressor// to the centre of the Earth. Gravity is dragging the ship in this direction with an effective thrust of 4, so this is applied to the final movement vector.+We find the vector from the //Aggressor// to the centre of the Earth. This is the direction that the ship is being dragged towards the planet - the direction is always taken from the start of movement. Since the gravitational thrust is 4", we apply a vector of 4" to the destination point in the same direction. 
 + 
 +=== Step Three: Determine final vector ===
  
 {{ :ft:gravity_3.png?nolink |}} {{ :ft:gravity_3.png?nolink |}}
 +
 +=== Step Four: Move the ship ===
  
 {{ :ft:gravity_4.png?nolink |}} {{ :ft:gravity_4.png?nolink |}}
  
ft/planets/gravity.1430085929.txt.gz · Last modified: 2015/04/26 22:05 by sam