Linkset resizer

Rescale every prim in an object

by Maestro Linden 20:55, 12 March 2010 (UTC)
This script uses the llGetLinkPrimitiveParams() and llSetLinkPrimitiveParamsFast() functions (introduced in server 1.38) to rescale every prim in a linkset. This script works for both objects rezzed on a parcel and attached objects. <lsl> // Linkset Resizer, by Maestro Linden, 2010.03.12 // This script rescales all prims in a linkset, using a scaling factor specified // by the user over chat. The script does some basic sanity checks (ensuring // that each prim stays within the allowed PRIM_SIZE range of 0.01m to 10m, although // it does *not* check the prim linkability rules, which are described in: // http://wiki.secondlife.com/wiki/Linkability_Rules

integer LISTEN_CHANNEL=4; // channel to listen on float MIN_DIMENSION=0.01; // the minimum scale of a prim allowed, in any dimension float MAX_DIMENSION=10.0; // the maximum scale of a prim allowed, in any dimension

list link_positions; list link_scales; float min_original_scale=10.0; // minimum x/y/z component of the scales in the linkset float max_original_scale=0.0; // minimum x/y/z component of the scales in the linkset float min_rescale_factor; float max_rescale_factor;

scanLinkset() {

  vector link_pos;
  vector link_scale;
  integer total_links=llGetNumberOfPrims();
  integer link;
  link_positions=[];
  link_scales=[];

  for(link=1; link<=total_links; link++)
  {
      link_pos=llList2Vector(llGetLinkPrimitiveParams(link,[PRIM_POSITION]),0);
      link_scale=llList2Vector(llGetLinkPrimitiveParams(link,[PRIM_SIZE]),0);
      
      // determine the minimum and maximum prim scales in the linkset, 
      //   so that rescaling doesn't fail due to prim scale limitations
      //   NOTE: the full linkability rules are _not_ checked by this script:
      //   http://wiki.secondlife.com/wiki/Linkability_Rules 
      if(link_scale.x<min_original_scale) min_original_scale=link_scale.x;
      else if(link_scale.x>max_original_scale) max_original_scale=link_scale.x;
      if(link_scale.y<min_original_scale) min_original_scale=link_scale.y;
      else if(link_scale.y>max_original_scale) max_original_scale=link_scale.y;
      if(link_scale.z<min_original_scale) min_original_scale=link_scale.z;
      else if(link_scale.z>max_original_scale) max_original_scale=link_scale.z;
      
      link_scales+=[link_scale];
      link_positions+=[(link_pos-llGetRootPosition())/llGetRootRotation()];
      
  }
  
  max_rescale_factor=MAX_DIMENSION/max_original_scale;
  min_rescale_factor=MIN_DIMENSION/min_original_scale;

}

rescaleLinkset(float scale) {

  integer link;
  vector pos_to_set;
  vector scale_to_set;
  integer total_links=llGetListLength(link_positions);
  
  for(link=1; link<=total_links; link++)
  {
      scale_to_set=llList2Vector(link_scales,link-1)*scale;
      pos_to_set=llList2Vector(link_positions,link-1)*scale;
      
      // don't move the root prim
      if(link==1) llSetLinkPrimitiveParamsFast(link,[PRIM_SIZE,scale_to_set]);
      else
      {
          llSetLinkPrimitiveParamsFast(link,[PRIM_POSITION,pos_to_set,PRIM_SIZE,scale_to_set]);
      }
  }

}

init() {

  llListen(LISTEN_CHANNEL,"",llGetOwner(),"");
  llOwnerSay("Say the scale that you want in channel "+(string)LISTEN_CHANNEL
   +" chat (e.g. \"/"+(string)LISTEN_CHANNEL+" 0.8\"), relative to the original scale.");
  llOwnerSay("The allowed rescaling range for this object is "
   +(string)min_rescale_factor+" - "+(string)max_rescale_factor);

}

default {

  state_entry()
  {
       scanLinkset();
       init();
  }

  on_rez(integer reznum)
  {
      init();
  }

  listen(integer channel, string name, key id, string msg)
  {
      float scale=(float)msg;
      
      if(scale<min_rescale_factor*0.999)
      {
          llSay(0,"ERROR: Cannot rescale to "+(string)scale
           +". The minimum allowed rescale factor for this object is "+(string)min_rescale_factor);
      }
      else if(scale>max_rescale_factor/0.999)
      {
          llSay(0,"ERROR: Cannot rescale to "+(string)scale
           +". The maximum allowed rescale factor for this object is "+(string)max_rescale_factor);
      }
      else
      {
          integer total_links=llGetListLength(link_positions);
          llOwnerSay("Setting "+(string)total_links+" prims to scale "+(string)scale+"..");
          rescaleLinkset(scale);
          llOwnerSay("..done");
      }
  }

} </lsl>