What just happened?

I was at http://maps.secondlife.com/secondlife/Alethia%20Island/219/163/22 yesterday and was trying to place a disk on the ground using CastRay( to get land position. llCastRay has an error here which sometimes gives zero return

I gave figures yesterday that gave:

mypos as 23.80663

floor_pos as 21.58119

groundpos as 20.58119

h as 2.860211

when the code below was called


// code placeholder

Move_and_resize_to_floor( float me_sz)
{

     if( _llisValidFloat((string) me_sz) == 1) mist_puddle_size = me_sz; else mist_puddle_size = 10.0;

     list ray = llCastRay(llGetPos(), llGetPos() + <5, 0, -100.0>,[RC_MAX_HITS|RC_GET_ROOT_KEY, 5]);// 
if(debug)  llOwnerSay(llDumpList2String(ray,"|")); 
     if(llList2Integer(ray, -1) < 0) {llOwnerSay("Ray Cast failed."); return;}     
     vector mypos = llGetPos();
     me_v_LocalPosition = llGetLocalPos();   
     integer i=0;
     float posv =566666;
     integer position;
     integer hasanobjectboveground = 0;
     float sizevobject;
     key floor_key = NULL_KEY;
     vector floor_pos = ZERO_VECTOR;
     lslground = ZERO_VECTOR;
     hasanobjectboveground = 0;
     mypos = llGetPos();
     // Lets clean up ray to remove any of or objects assosciated with the prim
     list obj_keys = GetObjectKeyList(LINK_SET) ;
     key lkID =  llList2Key(ray, i);
     while((llListFindList(obj_keys,[lkID]) != -1) )
       {
             ray = llDeleteSubList(ray, i, (i+2));
             lkID =  llList2Key(ray, i);
        }
        i = 0;
     lslground = ZERO_VECTOR;
     do {
            key lkID =  llList2Key(ray, i);
            if(lkID==NULL_KEY/* && lslground == ZERO_VECTOR */) {
                 lslground  =  llList2Vector(ray,i+1);
                 if(debug) llOwnerSay("Got LSL Floor");
           } else if(lkID!=NULL_KEY && (floor_pos == ZERO_VECTOR && (i<=llGetListLength(ray) - 1)))              {

if(debug) llOwnerSay("lkID " +(string)lkID+" calculation"+(string)(floor_pos == ZERO_VECTOR && hasanobjectboveground == 0)+" Got into Floor"+(string) llList2Vector(ray,i+1) + "Key "+(string)llList2Vector(ray,i));
                 hasanobjectboveground = 1;  
                 floor_key = llList2Key(ray,i);
                 floor_pos = llList2Vector(ray,i+1);

             }

           i+=2;
      } while(i<=llGetListLength(ray) - 1);

     key    ground_key ;  
     vector ground_pos ;     list box;
     float sz_from_object_on_floor=0; 

      if(hasanobjectboveground != 1) {
          ground_pos = floor_pos;
      } else { 
         ground_pos = lslground;
         floor_pos = floor_pos;
      }
      if(debug) llOwnerSay("Ground:" +(string)ground_pos + ", Floor:" +(string)floor_pos); 
  //   llOwnerSay("position " +(string)position + "m ground: " + (string)ground_pos);   
     // get inverse angle
     rotation Rootrot = llGetRootRotation();
     localrot = llGetRot();
     vector localEuler = llRot2Euler(Rootrot)*RAD_TO_DEG;
     localrot = llEuler2Rot(<0.0,90.0,90.0>*DEG_TO_RAD); 
     if(debug) llOwnerSay("Ground:" +(string)ground_pos); 
     //localpos = mypos-ground_pos;
      localpos = ground_pos-mypos;
     //localpos.x = ground_pos.z-mypos.z;
     list p = llGetLinkPrimitiveParams(LINK_ROOT,[PRIM_SIZE]);
     vector sz = llList2Vector(p,0);

     //New  trig work
     float h = llSqrt((0.5*sz.y)*(0.5*sz.y)+(0.5*sz.z)*(0.5*sz.z));
     if(debug) llOwnerSay("ofset of  myself diagonal "+(string)h);
     h += (mypos.z-floor_pos.z);

     float theta = RAD_TO_DEG * Rootrot.z; 
     if(h==previous_h && theta == previous_rot) return; 
     previous_h = h;
     previous_rot = theta;
     float distance_out  =  h/llTan(180-_llmod((theta),180,0));
     float x = 180 - _llmod((RAD_TO_DEG * Rootrot.z),180,0);
     float y  = llFabs((180-(x+90)));
     float y2 = llFabs((180-(x+y)));

      h -= llSqrt((0.5*sz.y)*(0.5*sz.y)+(0.5*sz.z)*(0.5*sz.z));
     float extra_remove = llFabs(llCos(y2));//+0.53;
if(debug) {
     llOwnerSay("h: " + (string)h +", Angle : " +(string)_llmod((RAD_TO_DEG * Rootrot.z),180,0)+ ", Cos"+(string)llFabs(llCos(y2)) + ", Sin "+(string)llFabs(llSin(y2))+", tan "+(string)llFabs(llTan(y2)));
     llOwnerSay("floor thickness "+(string)sz_from_object_on_floor+", x: " + (string)x + ", y:" + (string)y + ", y2: " + (string)y2 + ", Ground:" +(string)ground_pos + " Has Floor Flag " +(string)hasanobjectboveground + ", lslground "+(string)lslground); 
     llOwnerSay("Dist: " + (string)distance_out + ", extra " + (string)extra_remove);
    llOwnerSay("Before Addition, localpos" + (string)localpos + " My pos " + (string)mypos + "onfloor " +(string) on_floor + "Floor: " + (string)(floor_pos*DEG_TO_RAD) );   
} 
     // x is z in this prim
     localpos.z  = 0;//(h+.05);
     localpos.y = -(h - 3.32025); /*-2.71669 - .4409 - 0.07192 - 0.01174-.019); */
     localpos.x = - distance_out;if(debug) llOwnerSay("localpos" + (string)localpos + " My pos " + (string)mypos + "onfloor " +(string) on_floor + "Has object above ground: " + (string)hasanobjectboveground );  
       //localpos = _llvect_yzx(localpos);
     vector RootVector = llGetPos();     // z is x in this prim 

     if(on_floor == 1) {

             llSetLinkPrimitiveParamsFast(LINK_THIS,[
             PRIM_POS_LOCAL,localpos, 
             PRIM_SIZE, <mist_puddle_size/2,.01,mist_puddle_size>
             ]);  

           llMessageLinked(LINK_SET,-6500,"-6500|"+(string)llGetKey(),"");
           current_size= 10.0;     } else {
if(debug)            llOwnerSay("localPos: " + (string)localpos);
if(debug)            llOwnerSay("localRot: " + (string)localrot);
           mist_puddle_size=2.3;
           llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_POS_LOCAL , localpos, PRIM_ROT_LOCAL, llEuler2Rot(DEG_TO_RAD*localpos)/ llGetRootRotation(),PRIM_SIZE, <mist_puddle_size/2,0.01,mist_puddle_size>]);
         //  llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_POS_LOCAL, localpos/*llGetLocalPos()*localrot*/,PRIM_SIZE, <mist_puddle_size,0.01,mist_puddle_size/2>]);
          // llSleep(3);           llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_ROT_LOCAL, localrot/ llGetRootRotation()]);
           llMessageLinked(LINK_SET,-6500,"-6500|"+(string)llGetKey(),"");
           current_size = 0.1;
           expanding_or_shrinking_flag = 3; 
           on_floor = 1;

         }    
        // get boundaries        
}

This placed the link item the script was in at z height 18.29153 and not 21.3131469 which had been calculated from cast Ray

localpos was assigned here manually

// x is z in this prim localpos.z = 0;//(h+.05); localpos.y = -(h ) localpos.x = - distance_out;

These are all calculated in script with h as height from mypos to ground and distance as the triangular distance out . I cannot understand why this doesnt place the item at the location z = 21.3131469 when mypos.z (23.80663) - floor_pos(21.21469) = h = 2.860211.

Then using llSetLinkPrimitiveParamsFast(LINK_THIS,[ PRIM_POS_LOCAL,localpos, PRIM_SIZE, <mist_puddle_size/2,.01,mist_puddle_size> ]);

Should place it at localpos.z as an offset from the root which it doesn't it seems to place it at a lower location on z as 18.29153

Can anyone explain please as I am pulling my hair and having to put it in braids as this makes no sense at all.

What were you doing when it happened?

I was expecting item to be at the location given

What were you expecting to happen instead?

the item was at a different location

Other information

the item should be at the mathematical place

Original Jira Fields

| Field | Value | | ------------- | ------------- | | Issue | BUG-225639 | | Summary | manually setting localpos with numeric values that worth mathematically will not place a linked object at the mathematical expected position when using llSetLinkPrimitiveParamsFast(LINK_THIS | | Type | Bug | | Priority | Unset | | Status | Closed | | Resolution | Unactionable | | Reporter | VirtualKitten (virtualkitten) | | Created at | 2018-10-16T16:04:58Z | | Updated at | 2018-11-05T19:16:40Z | ``` { 'Build Id': 'unset', 'Business Unit': ['Platform'], 'Date of First Response': '2018-11-05T13:16:40.451-0600', "Is there anything you'd like to add?": 'the item should be at the mathematical place', 'ReOpened Count': 0.0, 'Severity': 'Unset', 'System': 'SL Simulator', 'Target Viewer Version': 'viewer-development', 'What just happened?': 'I was at http://maps.secondlife.com/secondlife/Alethia%20Island/219/163/22 yesterday and was trying to place a disk on the ground using CastRay( to get land position. llCastRay has an error here which sometimes gives zero return\r\n\r\n', 'What were you doing when it happened?': 'I was expecting item to be at the location given', 'What were you expecting to happen instead?': 'the item was at a different location', 'Where': 'Firestorm 5.1.7 (55786) Jul 13 2018 20:00:04 (64bit) (Firestorm-Releasex64) with Havok support\r\nRelease Notes\r\n\r\nYou are at 219.1, 163.0, 22.1 in Alethia Island located at sim8841.agni.lindenlab.com (216.82.41.17:13004)\r\nSLURL: http://maps.secondlife.com/secondlife/Alethia%20Island/219/163/22\r\n(global coordinates 129,499.0, 261,795.0, 22.1)\r\nSecond Life Server 18.09.20.519894\r\nRelease Notes\r\n\r\nCPU: Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz (2520 MHz)\r\nMemory: 4095 MB\r\nOS Version: Microsoft Windows 10 64-bit (Build 17134)\r\nGraphics Card Vendor: NVIDIA Corporation\r\nGraphics Card: GeForce GTX 660/PCIe/SSE2\r\n\r\nWindows Graphics Driver Version: 23.21.13.8813\r\nOpenGL Version: 4.6.0 NVIDIA 388.13\r\n\r\nRestrainedLove API: (disabled)\r\nlibcurl Version: libcurl/7.54.1 OpenSSL/1.0.2l zlib/1.2.8 nghttp2/1.25.0\r\nJ2C Decoder Version: KDU v7.10.4\r\nAudio Driver Version: FMOD Studio 1.10.05\r\nDullahan: 1.1.1080 / CEF: 3.3325.1750.gaabe4c4 / Chromium: 65.0.3325.146\r\nLibVLC Version: 2.2.8\r\nVoice Server Version: Vivox 4.9.0002.27586\r\n\r\nSettings mode: Firestorm\r\nViewer Skin: Firestorm (Grey)\r\nWindow size: 1600x837 px\r\nFont Used: Deja Vu (96 dpi)\r\nFont Size Adjustment: 0 pt\r\nUI Scaling: 1\r\nDraw distance: 128 m\r\nBandwidth: 500 kbit/s\r\nLOD factor: 2\r\nRender quality: High-Ultra (6/7)\r\nAdvanced Lighting Model: Yes\r\nTexture memory: 512 MB (1)\r\nVFS (cache) creation time (UTC): 2018-9-16T20:48:42 \r\nBuilt with MSVC version 1800\r\nPackets Lost: 48/20,891 (0.2%)\r\nOctober 16 2018 09:03:09 SLT', } ```

secondlife / jira-archive

[BUG-225639] manually setting localpos with numeric values that worth mathematically will not place a linked object at the mathematical expected position when using llSetLinkPrimitiveParamsFast(LINK_THIS #4390

What just happened?

What were you doing when it happened?

What were you expecting to happen instead?

Other information