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Describe a surface using functions to locate points on the surface:
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PARAMETRIC:
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parametric { FLOAT_USER_FUNCTION, FLOAT_USER_FUNCTION, FLOAT_USER_FUNCTION 2D_VECTOR,
2D_VECTOR [PARAMETRIC_ITEMS] [UV_MAPPING] & [OBJECT_MODIFIERS] }
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PARAMETRIC_ITEMS:
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[contained_by { CONTAINER }] & [max_gradient FLOAT]
& [accuracy FLOAT] & [precompute I_DEPTH, x, y, z]
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CONTAINER:
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sphere { V_CENTER, F_RADIUS } | box { V_CORNER1,
V_CORNER2 }
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