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shading.m
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shading.m
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f u n c t i o n [ p o i n t s _ r e d u c e d ] = s h a d i n g ( p o i n t s , v e r t i c e s )
% t h i s f u n c t i o n m i g h t r e q u i r e s y o u t o i n p u t o n e s e t o f p o i n t s , a s
% w e l l a s a s e t o f v e r t i c e s , a n d s e e w h i c h o f t h e p o i n t s l i e i n
% a n y o f t h e t r i a n g l e s . I t t h e n r e m o v e s a l l p o i n t s t h a t d o n o t
% e x i s t w i t h i n a n y o f t h e t r i a n g l e s . T h i n k h o w m i g h t t h i s b e u s e d
% f o r s h a d i n g ?
n = s i z e ( p o i n t s , 1 ) ;
m = s i z e ( v e r t i c e s , 1 ) ;
p o i n t s _ r e d u c e d = z e r o s ( n , 3 ) ;
l = 0 ;
f o r i = 1 : n
f o r j = 1 : ( m / 3 )
a = j - 1 ;
i f p o i n t _ i n _ t r i a n g l e ( p o i n t s ( i , : ) , [ v e r t i c e s ( ( 3 * a + 1 ) , : ) ; v e r t i c e s ( ( 3 * a + 2 ) , : ) ; v e r t i c e s ( ( 3 * a + 3 ) , : ) ] ) = = 1
p o i n t s _ r e d u c e d ( i , : ) = p o i n t s ( i , : ) ;
l = l + 1 ;
b r e a k
e n d
e n d
e n d
p o i n t s _ r e d u c e d ( l : n , : ) = [ ] ;