copy a plane game from three.js plane demo
####DirectionalLight( hex, intensity )
- hex -- Numeric value of the RGB component of the color.
- intensity -- Numeric value of the light's strength/intensity.
#####Properties
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.target Target used for shadow camera orientation.
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.shadow This property stores all relevant information for rendering the shadow of the light.
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.castShadow If set to true light will cast dynamic shadows. Warning: This is expensive and requires tweaking to get shadows looking right. Default — false.