new VelocityFieldPoint(xPos, yPos, dirX, dirY, velocity)
    Entry of a VelocityField
    Parameters:
| Name | Type | Description | 
|---|---|---|
xPos | 
            
            number | x position | 
yPos | 
            
            number | y position | 
dirX | 
            
            number | x direction | 
dirY | 
            
            number | y direction | 
velocity | 
            
            number | velocity at this position | 
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