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LSL Wiki : llSetLinkAlpha

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llSetLinkAlpha(integer linknumber, float alpha, integer face)

Sets the side number face on the linked child linknumber to the transparency alpha.

If face == ALL_SIDES, this function sets the alpha on all faces of the specified prim(s). If linknumber == LINK_SET, this function sets alpha on all prims in the link set (including the task). This allows setting an entire object in one call rather than being forced to use a for loop.

There is no "llGetLinkAlpha" function. For that, use a script with llGetAlpha in the specific prim, and communicate with your main script with Link Messages.

Q: How do I determine which side of an object this applies to?
A: See side.

To set the alpha of the current prim by itself, use llSetAlpha (though llSetLinkAlpha will still work).
To set the color of other prims in the object, use llSetLinkColor.
To set the texture of other prims in the object, use llSetLinkTexture.
To set any primitive parameters of other prims in the object, use llSetLinkPrimitiveParams.

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Functions | Link | Alpha
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