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Function: vector llGroundNormal( vector offset );

Returns a vector that is the ground normal from the current position + offset.

• vector offset offset relative to the prim's position and expressed in local coordinates

The requested position needs to be in the same region. Only the x and y coordinates in offset are important, the z component is ignored.


This function is defined as:

vector llGroundNormal(vector offset)
    vector slope = llGroundSlope(offset);
    return <slope.x, slope.y, 1.0>;



  • There seems to some confusion be between a Surface Normal (the direction from the surface) and Normalized Vector (a vector with a magnitude of 1.0, AKA Unit Vector). This function does not return a unit vector. Surface normals may encode additional information in the magnitude of the vector. If you need a Unit Vector, simply use llVecNorm.

See Also


•  llGround Gets the ground height
•  llGroundContour Gets the ground contour
•  llGroundSlope Gets the ground slope

Deep Notes


Search JIRA for related Issues


  1. ^ Early release notes were not very accurate or thorough, they sometimes included information about features added in previous releases or failed to include information about features added in that release.


function vector llGroundNormal( vector offset );