Is slope {<0,-1,0>,0,1} equivalent to slope{<0,-1,0>}?
similarly is slope {<0,-1,0>,0,1 altitude <0,1,0>,0,1}
equivalent to slope {<0,-1,0>,0,1 altitude <0,1,0>}?
If so, is that true in the general case or just in some cases?

If slope is used in a normal, where is the bump_size specified?

Gail
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