LlGetPrimitiveParams

Returns a list that is the primitive parameters specified in the params list.

PRIM_* flags can be broken into two categories, face flags and prim flags.

• Supplying a prim flag will return that flags attributes.
• Face flags require the user to also supply a side parameter.

To test whether an object is a point light source, and if so get its parameters:

string msg = "Object is ";
integer isLight;
vector colour;
float intensity;
float radius;
float falloff;
list params = llGetPrimitiveParams([PRIM_POINT_LIGHT]);
isLight = llList2Integer(params, 0);
if (isLight == FALSE)
    msg += "not a light source.";
else
{
    colour = llList2Vector(params, 1);
    intensity = llList2Float(params, 2);
    radius = llList2Float(params, 3);
    falloff = llList2Float(params, 4);
    msg += "a point light source.\nColour = "+(string)colour;
    msg += "\nIntensity = "+(string)intensity;
    msg += "\nRadius = "+(string)radius;
    msg += "\nFalloff = "+(string)falloff;
}
llSay(0, msg);

list GetPrimitiveParams(list input)
{//Returns a list that can be fed to llSetPrimitiveParams
    list output;
    integer c = ~llGetListLength(input);
    while(0x80000000 & (c = - ~c))
    {
        list flag = (list)llList2Integer(input, c);
        if(~llListFindList([PRIM_BUMP_SHINY, PRIM_COLOR, PRIM_TEXTURE, 
                            PRIM_FULLBRIGHT, PRIM_TEXGEN, PRIM_GLOW], flag ))
        {
            integer side = llList2Integer(input, (c = - ~c));
            if(~side)//pop the stack
                output += flag + side + llGetPrimitiveParams( flag + side );
            else
            {
                side = llGetNumberOfSides();
                do //we return the sides in reverse order, easier to code; runs faster.
                    output += flag + side + llGetPrimitiveParams( flag + (side = ~ -side) );
                while(side);
            }
        }
        else
            output += flag + llGetPrimitiveParams( flag );
    }
    return output;
}
//Contributed by Strife Onizuka

SetPrimitiveParams-Example by Anylyn Hax makes reading primitive parameters easy.

Link Numbers

Each prim that makes up an object has an address, a link number. To access a specific prim in the object, the prim's link number must be known. In addition to prims having link numbers, avatars seated upon the object do as well.

• If an object consists of only one prim, and there are no avatars seated upon it, the (root) prim's link number is zero.
• However, if the object is made up of multiple prims or there is an avatar seated upon the object, the root prim's link number is one.

When an avatar sits on an object, it is added to the end of the link set and will have the largest link number. In addition to this, while an avatar is seated upon an object, the object is unable to link or unlink prims without unseating the avatars first.

Counting Prims & Avatars

There are two functions of interest when trying to find the number of prims and avatars on an object.

• llGetNumberOfPrims() - Returns the number of prims and seated avatars.
• llGetObjectPrimCount(llGetKey()) - Returns only the number of prims in the object but will return zero for attachments.

integer GetPrimCount() { //always returns only the number of prims
    if(llGetAttached())//Is it attached?
        return llGetNumberOfPrims();//returns avatars and prims but attachments can't be sat on.
    return llGetObjectPrimCount(llGetKey());//returns only prims but won't work on attachments.
}

Functions

Articles

Footnotes

function list llGetPrimitiveParams( list params );
integer PRIM_PHYSICS_SHAPE_PRIM = 0;//Use the normal prim shape for physics
integer PRIM_PHYSICS_SHAPE_CONVEX = 2;//Use the convex hull of the prim shape for physics
integer PRIM_PHYSICS_SHAPE_NONE = 1;//Ignore this prim in the physics shape