Draw a sphere: Difference between revisions
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m (→{{header|REXX}}: elided one comment, added/changed whitespace and comments, optimized sqrt function.) |
m (→{{header|REXX}}: used a more idiomatic expression for getting the minimum.) |
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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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dot= min(0, dot) /*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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if b<=0 then brite= shadeLen |
if b<=0 then brite= shadeLen |
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