Draw a sphere: Difference between revisions
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m (→{{header|REXX}}: added/changed comments and whitespace, simplified and optimized a function, used a template for the output.) |
m (→{{header|REXX}}: added a comment that shows an alternative syntax.) |
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parse value norm(x y sqrt(rr-xx-yy) ) with v1 v2 v3 |
parse value norm(x y sqrt(rr-xx-yy) ) with v1 v2 v3 |
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dot=s1*v1 + s2*v2 + s3*v3 /*the dot product of the Vs*/ |
dot=s1*v1 + s2*v2 + s3*v3 /*the dot product of the Vs*/ |
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if dot>0 then dot=0 /*if positive, make it zero*/ /*◄■■■■ same as: dot=max(0, dot) */ |
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if dot>0 then dot=0 /*if positive, make it zero*/ |
if dot>0 then dot=0 /*if positive, make it zero*/ |
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b=-dot**k + ambient /*calculate the brightness.*/ |
b=-dot**k + ambient /*calculate the brightness.*/ |
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