Comment on guess where by utenafangirl

yep [link] this is the basic knowledge of perspective
[link] this was another way i learned
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even making circles and ovals in perspective this way
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this is how we grid a floor plane (like the floor of a house)
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also shading with perspective
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even stairs in perspective...

all mathimatical it is like a learn first then apply later when your good you can estimate your perspective lines