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Vectors literals consist of two to five float expressions that are bracketed by angle brackets < and >. The terms are separated by commas. For example here is a typical three component vector:
< 1.0, 3.2, -5.4578 >
The commas between components are necessary to keep the program from thinking that the 2nd term is the single float expression 3.2-5.4578 and that there is no 3rd term. If you see an error message such as "Float expected but '>' found instead" then you probably have missed a comma.
Sometimes POV-Ray requires you to specify floats and vectors side-by-side. The rules for vector expressions allow for mixing of vectors with vectors or vectors with floats so commas are required separators whenever an ambiguity might arise. For example <1,2,3>-4 evaluates as a mixed float and vector expression where 4 is subtracted from each component resulting in <-3,-2,-1>. However the comma in <1,2,3>,-4 means this is a vector followed by a float.
Each component may be a full float expression. For example <This+3,That/3,5*Other_Thing> is a valid vector.
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