0007351: llCastRay returns hits incorrectly outside rotated objects

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Date Submitted

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0007351

opensim

[REGION] Script Functions

public

2014-10-12 09:33

2015-04-29 09:25

Reporter

Kayaker Magic

Assigned To

Priority

normal

Severity

minor

Reproducibility

always

Status

new

Resolution

open

Platform

any 0.8 Pot_Fixes

0.8

OS Version

0.8

Product Version

Target Version

Fixed in Version

Summary

0007351: llCastRay returns hits incorrectly outside rotated objects

Description

llCastRay reports hits on nearby objects when it should not. It seems to report a hit when the ray passes through a XY aligned bounding box that encloses the hit object. So objects rotated 45 degrees have large bounding boxes that return false positives.

Steps To Reproduce

Wear a small prim on your HUD center, put the following script in it. This reports the name of the nearest object below your avatar.
Create a block that is long and thin, 2x10x0.5 meters. Push it partway into the ground so you can walk over it and watch the HUD display change from ground to primitive.

Rotate the long thing primitive 45 degrees around z. Now when you walk around the primitive, the HUD will display the prim name when you are far away from the prim.

Additional Information

default
{
    state_entry()
    {
        llSetTimerEvent(1.0);
    }
    timer()
    {
        list hits=llCastRay(llGetPos()-<0,0,.5>,llGetPos()-<0,0,5.5>,[]);
        if (llList2Integer(hits,-1)>0) //if cast ray fonund something
        {
            key id=llList2Key(hits,0); //get the first one
            if (id==NULL_KEY)
                llSetText("ground",<1,1,0>,1.0);
            else
                llSetText(llKey2Name(id),<0,1,0>,1.0);
        }
        else
            llSetText("nothing",<1,0,0>,1.0);
    }
}

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Git Revision or version number

Run Mode

Grid (Multiple Regions per Sim)

Physics Engine

BulletSim

Script Engine

Environment

.NET / Windows64

Mono Version

Other