C++ LLViewerRegion::getPosRegionFromGlobal方法代码示例

// Draw the area that will be affected.
void LLToolBrushLand::render()
{
	if(mGotHover)
	{
		//llinfos << "LLToolBrushLand::render()" << llendl;
		LLVector3d spot;
		if(gViewerWindow->mousePointOnLandGlobal(mMouseX, mMouseY, &spot))
		{
			spot.mdV[VX] = floor( spot.mdV[VX] + 0.5 );
			spot.mdV[VY] = floor( spot.mdV[VY] + 0.5 );

			mBrushSize = gSavedSettings.getF32("LandBrushSize");
			
			region_list_t regions;
			determineAffectedRegions(regions, spot);

			// Now, for each region, render the overlay
			LLVector3 pos_world = gAgent.getRegion()->getPosRegionFromGlobal(spot);
			for(region_list_t::iterator iter = regions.begin();
				iter != regions.end(); ++iter)
			{
				LLViewerRegion* region = *iter;
				renderOverlay(region->getLand(), 
							  region->getPosRegionFromGlobal(spot),
							  pos_world);
			}
		}
		mGotHover = FALSE;
	}
}

LLViewerRegion* LLWorld::resolveRegionGlobal(LLVector3 &pos_region, const LLVector3d &pos_global)
{
	LLViewerRegion *regionp = getRegionFromPosGlobal(pos_global);

	if (regionp)
	{
		pos_region = regionp->getPosRegionFromGlobal(pos_global);
		return regionp;
	}

	return NULL;
}

LLViewerRegion* LLWorld::resolveRegionAgent(LLVector3 &pos_region, const LLVector3 &pos_agent)
{
	LLVector3d pos_global = gAgent.getPosGlobalFromAgent(pos_agent);
	LLViewerRegion *regionp = getRegionFromPosGlobal(pos_global);

	if (regionp)
	{
		pos_region = regionp->getPosRegionFromGlobal(pos_global);
		return regionp;
	}

	return NULL;
}

void LLToolBrushLand::modifyLandInSelectionGlobal()
{
	if (LLViewerParcelMgr::getInstance()->selectionEmpty())
	{
		return;
	}

	if (LLToolMgr::getInstance()->getCurrentTool() == LLToolSelectLand::getInstance())
	{
		// selecting land, don't do anything
		return;
	}

	LLVector3d min;
	LLVector3d max;

	LLViewerParcelMgr::getInstance()->getSelection(min, max);

	S32 radioAction = gSavedSettings.getS32("RadioLandBrushAction");

	mLastAffectedRegions.clear();

	determineAffectedRegions(mLastAffectedRegions, LLVector3d(min.mdV[VX], min.mdV[VY], 0));
	determineAffectedRegions(mLastAffectedRegions, LLVector3d(min.mdV[VX], max.mdV[VY], 0));
	determineAffectedRegions(mLastAffectedRegions, LLVector3d(max.mdV[VX], min.mdV[VY], 0));
	determineAffectedRegions(mLastAffectedRegions, LLVector3d(max.mdV[VX], max.mdV[VY], 0));

	LLRegionPosition mid_point_region((min + max) * 0.5);
	LLViewerRegion* center_region = mid_point_region.getRegion();
	if (center_region)
	{
		LLVector3 pos_region = mid_point_region.getPositionRegion();
		U32 grids = center_region->getLand().mGridsPerEdge;
		S32 i = llclamp( (S32)pos_region.mV[VX], 0, (S32)grids );
		S32 j = llclamp( (S32)pos_region.mV[VY], 0, (S32)grids );
		mStartingZ = center_region->getLand().getZ(i+j*grids);
	}
	else
	{
		mStartingZ = 0.f;
	}

	// Stop if our selection include a no-terraform region
	for(region_list_t::iterator iter = mLastAffectedRegions.begin();
		iter != mLastAffectedRegions.end(); ++iter)
	{
		LLViewerRegion* regionp = *iter;
		if (!canTerraform(regionp))
		{
			alertNoTerraform(regionp);
			return;
		}
	}

	for(region_list_t::iterator iter = mLastAffectedRegions.begin();
		iter != mLastAffectedRegions.end(); ++iter)
	{
		LLViewerRegion* regionp = *iter;
		//BOOL is_changed = FALSE;
		LLVector3 min_region = regionp->getPosRegionFromGlobal(min);
		LLVector3 max_region = regionp->getPosRegionFromGlobal(max);
	
		min_region.clamp(0.f, regionp->getWidth());
		max_region.clamp(0.f, regionp->getWidth());
		F32 seconds = gSavedSettings.getF32("LandBrushForce");

		LLSurface &land = regionp->getLand();
		char action = E_LAND_LEVEL;
		switch (radioAction)
		{
		case 0:
		//	// average toward mStartingZ
			action = E_LAND_LEVEL;
			seconds *= 0.25f;
			break;
		case 1:
			action = E_LAND_RAISE;
			seconds *= 0.25f;
			break;
		case 2:
			action = E_LAND_LOWER;
			seconds *= 0.25f;
			break;
		case 3:
			action = E_LAND_SMOOTH;
			seconds *= 5.0f;
			break;
		case 4:
			action = E_LAND_NOISE;
			seconds *= 0.5f;
			break;
		case 5:
			action = E_LAND_REVERT;
			seconds = 0.5f;
			break;
		default:
			//action = E_LAND_INVALID;
			//seconds = 0.0f;
			return;
			break;
//.........这里部分代码省略.........

void LLToolBrushLand::modifyLandAtPointGlobal(const LLVector3d &pos_global,
											  MASK mask)
{
	S32 radioAction = gSavedSettings.getS32("RadioLandBrushAction");
	
	mLastAffectedRegions.clear();
	determineAffectedRegions(mLastAffectedRegions, pos_global);
	for(region_list_t::iterator iter = mLastAffectedRegions.begin();
		iter != mLastAffectedRegions.end(); ++iter)
	{
		LLViewerRegion* regionp = *iter;
		//BOOL is_changed = FALSE;
		LLVector3 pos_region = regionp->getPosRegionFromGlobal(pos_global);
		LLSurface &land = regionp->getLand();
		char action = E_LAND_LEVEL;
		switch (radioAction)
		{
		case 0:
		//	// average toward mStartingZ
			action = E_LAND_LEVEL;
			break;
		case 1:
			action = E_LAND_RAISE;
			break;
		case 2:
			action = E_LAND_LOWER;
			break;
		case 3:
			action = E_LAND_SMOOTH;
			break;
		case 4:
			action = E_LAND_NOISE;
			break;
		case 5:
			action = E_LAND_REVERT;
			break;
		default:
			action = E_LAND_INVALID;
			break;
		}

		// Don't send a message to the region if nothing changed.
		//if(!is_changed) continue;

		// Now to update the patch information so it will redraw correctly.
		LLSurfacePatch *patchp= land.resolvePatchRegion(pos_region);
		if (patchp)
		{
			patchp->dirtyZ();
		}

		// Also force the property lines to update, normals to recompute, etc.
		regionp->forceUpdate();

		// tell the simulator what we've done
		F32 seconds = (1.0f / gFPSClamped) * gSavedSettings.getF32("LandBrushForce");
		F32 x_pos = (F32)pos_region.mV[VX];
		F32 y_pos = (F32)pos_region.mV[VY];
		LLMessageSystem* msg = gMessageSystem;
		msg->newMessageFast(_PREHASH_ModifyLand);
		msg->nextBlockFast(_PREHASH_AgentData);
		msg->addUUIDFast(_PREHASH_AgentID, gAgent.getID());
		msg->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());
		msg->nextBlockFast(_PREHASH_ModifyBlock);
		msg->addU8Fast(_PREHASH_Action, (U8)action);
		msg->addU8Fast(_PREHASH_BrushSize, getBrushIndex());
		msg->addF32Fast(_PREHASH_Seconds, seconds);
		msg->addF32Fast(_PREHASH_Height, mStartingZ);
		msg->nextBlockFast(_PREHASH_ParcelData);
		msg->addS32Fast(_PREHASH_LocalID, -1);
		msg->addF32Fast(_PREHASH_West, x_pos );
		msg->addF32Fast(_PREHASH_South, y_pos );
		msg->addF32Fast(_PREHASH_East, x_pos );
		msg->addF32Fast(_PREHASH_North, y_pos );
		msg->nextBlock("ModifyBlockExtended");
		msg->addF32("BrushSize", mBrushSize);
		msg->sendMessage(regionp->getHost());
	}
}

void KVFloaterFlickrUpload::uploadSnapshot()
{
	mTitle = childGetValue("title_form").asString();
	LLSD params;
	params["title"] = childGetValue("title_form");
	params["safety_level"] = childGetValue("rating_combo");
	std::string tags = childGetValue("tags_form");
	std::string description = childGetValue("description_form");
	if(childGetValue("show_position_check").asBoolean())
	{
		// Work out where this was taken.
		LLVector3d clamped_global = LLWorld::getInstance()->clipToVisibleRegions(gAgent.getPositionGlobal(), mPosTakenGlobal);
		LLViewerRegion* region = LLWorld::getInstance()->getRegionFromPosGlobal(clamped_global);
		if(!region)
		{
			// Clamping failed? Shouldn't happen.
			// Use the agent's position instead; if the region the agent is in doesn't exist we have some serious issues,
			// and crashing is an entirely reasonable thing to do.
			region = gAgent.getRegion();
			clamped_global = gAgent.getPositionGlobal();
		}
		std::string region_name = region->getName();
		LLVector3 region_pos = region->getPosRegionFromGlobal(clamped_global);
		std::ostringstream region_tags;
		region_tags << " \"secondlife:region=" << region_name << "\"";
		region_tags << " secondlife:x=" << llround(region_pos[VX]);
		region_tags << " secondlife:y=" << llround(region_pos[VY]);
		region_tags << " secondlife:z=" << llround(region_pos[VZ]);

		// Now let's give some precise camera values.
		region_tags << " secondlife:camera_pos_x=" << (mPosTakenGlobal[VX] - region->getOriginGlobal()[VX]);
		region_tags << " secondlife:camera_pos_y=" << (mPosTakenGlobal[VY] - region->getOriginGlobal()[VY]);
		region_tags << " secondlife:camera_pos_z=" << mPosTakenGlobal[VZ];
		tags += region_tags.str();

		// Include an SLurl in the description, too (maybe).
		if(gSavedSettings.getBOOL("KittyFlickrIncludeSLURL"))
		{
			LLSLURL url(region_name, region_pos);
			std::ostringstream region_desc;
			region_desc << "<em><a href='" << url.getSLURLString() << "'>";
			region_desc << "Taken at " << region_name << " (";
			region_desc << llround(region_pos[VX]) << ", ";
			region_desc << llround(region_pos[VY]) << ", ";
			region_desc << llround(region_pos[VZ]) << ")";
			region_desc << "</a></em>";
			if(description != "")
			{
				description += "\n\n";
			}
			description += region_desc.str();
		}
	}
	params["tags"] = tags;
	params["description"] = description;
	LL_INFOS("FlickrAPI") << "Uploading snapshot with metadata: " << params << LL_ENDL;

	params["auth_token"] = gSavedPerAccountSettings.getLLSD("KittyFlickrToken");
	LLUploadDialog::modalUploadDialog(getString("uploading"));
	KVFlickrRequest::uploadPhoto(params, mCompressedImage, boost::bind(&KVFloaterFlickrUpload::imageUploaded, this, _1, _2));
}

//.........这里部分代码省略.........
						line.append(LLTrans::getString("TooltipFreeToCopy"));
						suppressObjectHoverDisplay = FALSE;		//  Show tip
					}
					else if (for_sale)
					{
						LLStringUtil::format_map_t args;
						args["[AMOUNT]"] = llformat("%d", nodep->mSaleInfo.getSalePrice());
						line.append(LLTrans::getString("TooltipForSaleL$", args));
						suppressObjectHoverDisplay = FALSE;		//  Show tip
					}
					else
					{
						// Nothing if not for sale
						// line.append("Not for sale");
					}
				}
				else
				{
					LLStringUtil::format_map_t args;
					args["[MESSAGE]"] = LLTrans::getString("RetrievingData");
					line.append(LLTrans::getString("TooltipForSaleMsg", args));
				}
				mText.push_back(line);
			}
			line.clear();
			S32 prim_count = LLSelectMgr::getInstance()->getHoverObjects()->getObjectCount();
			line.append(llformat("Prims: %d", prim_count));
			mText.push_back(line);

			line.clear();
			line.append("Position: ");

			LLViewerRegion *region = gAgent.getRegion();
			LLVector3 position = region->getPosRegionFromGlobal(hit_object->getPositionGlobal());//regionp->getOriginAgent();
			LLVector3 mypos = region->getPosRegionFromGlobal(gAgent.getPositionGlobal());
			

			LLVector3 delta = position - mypos;
			F32 distance = (F32)delta.magVec();

			line.append(llformat("<%.02f,%.02f,%.02f>",position.mV[0],position.mV[1],position.mV[2]));
			mText.push_back(line);
			line.clear();
			line.append(llformat("Distance: %.02fm",distance));
			mText.push_back(line);
			
			//  If the hover tip shouldn't be shown, delete all the object text
			if (suppressObjectHoverDisplay)
			{
				mText.clear();
			}
		}
	}
	else if ( mHoverLandGlobal != LLVector3d::zero )
	{
		// 
		//  Do not show hover for land unless prefs are set to allow it.
		// 
		
		if (!gSavedSettings.getBOOL("ShowLandHoverTip")) return; 

		// Didn't hit an object, but since we have a land point we
		// must be hovering over land.

		LLParcel* hover_parcel = LLViewerParcelMgr::getInstance()->getHoverParcel();
		LLUUID owner;

BOOL LLToolPlacer::raycastForNewObjPos( S32 x, S32 y, LLViewerObject** hit_obj, S32* hit_face,
                                        BOOL* b_hit_land, LLVector3* ray_start_region, LLVector3* ray_end_region, LLViewerRegion** region )
{
    F32 max_dist_from_camera = gSavedSettings.getF32( "MaxSelectDistance" ) - 1.f;

    // Viewer-side pick to find the right sim to create the object on.
    // First find the surface the object will be created on.
    gViewerWindow->hitObjectOrLandGlobalImmediate(x, y, NULL, FALSE);

    // Note: use the frontmost non-flora version because (a) plants usually have lots of alpha and (b) pants' Havok
    // representations (if any) are NOT the same as their viewer representation.
    *hit_obj = gObjectList.findObject( gLastHitNonFloraObjectID );
    *hit_face = gLastHitNonFloraObjectFace;
    *b_hit_land = !(*hit_obj) && !gLastHitNonFloraPosGlobal.isExactlyZero();
    LLVector3d land_pos_global = gLastHitNonFloraPosGlobal;

    // Make sure there's a surface to place the new object on.
    BOOL bypass_sim_raycast = FALSE;
    LLVector3d	surface_pos_global;
    if (*b_hit_land)
    {
        surface_pos_global = land_pos_global;
        bypass_sim_raycast = TRUE;
    }
    else if (*hit_obj)
    {
        surface_pos_global = (*hit_obj)->getPositionGlobal();
    }
    else
    {
        return FALSE;
    }

    // Make sure the surface isn't too far away.
    LLVector3d ray_start_global = gAgent.getCameraPositionGlobal();
    F32 dist_to_surface_sq = (F32)((surface_pos_global - ray_start_global).magVecSquared());
    if( dist_to_surface_sq > (max_dist_from_camera * max_dist_from_camera) )
    {
        return FALSE;
    }

    // Find the sim where the surface lives.
    LLViewerRegion *regionp = gWorldp->getRegionFromPosGlobal(surface_pos_global);
    if (!regionp)
    {
        llwarns << "Trying to add object outside of all known regions!" << llendl;
        return FALSE;
    }

    // Find the simulator-side ray that will be used to place the object accurately
    LLVector3d		mouse_direction;
    mouse_direction.setVec( gViewerWindow->mouseDirectionGlobal( x, y ) );

    *region = regionp;
    *ray_start_region =	regionp->getPosRegionFromGlobal( ray_start_global );
    F32 near_clip = gCamera->getNear() + 0.01f;  // Include an epsilon to avoid rounding issues.
    *ray_start_region += gCamera->getAtAxis() * near_clip;

    if( bypass_sim_raycast )
    {
        // Hack to work around Havok's inability to ray cast onto height fields
        *ray_end_region = regionp->getPosRegionFromGlobal( surface_pos_global );  // ray end is the viewer's intersection point
    }
    else
    {
        LLVector3d		ray_end_global = ray_start_global + (1.f + max_dist_from_camera) * mouse_direction;  // add an epsilon to the sim version of the ray to avoid rounding problems.
        *ray_end_region = regionp->getPosRegionFromGlobal( ray_end_global );
    }

    return TRUE;
}

//.........这里部分代码省略.........
							line.append(LLTrans::getString("TooltipFreeToCopy"));
							suppressObjectHoverDisplay = FALSE;		//  Show tip
						}
						else if (for_sale)
						{
							LLStringUtil::format_map_t args;
							args["[AMOUNT]"] = llformat("%d", nodep->mSaleInfo.getSalePrice());
							line.append(LLTrans::getString("TooltipForSaleL$", args));
							suppressObjectHoverDisplay = FALSE;		//  Show tip
						}
						else
						{
							// Nothing if not for sale
							// line.append("Not for sale");
						}
					}
					else
					{
						LLStringUtil::format_map_t args;
						args["[MESSAGE]"] = LLTrans::getString("RetrievingData");
						retrieving_data = true;
						line.append(LLTrans::getString("TooltipForSaleMsg", args));
					}
					mText.push_back(line);
					line.clear();
					S32 prim_count = LLSelectMgr::getInstance()->getHoverObjects()->getObjectCount();
					line.append(llformat("Prims: %d", prim_count));
					mText.push_back(line);

					line.clear();
					line.append("Position: ");

					LLViewerRegion *region = gAgent.getRegion();
					LLVector3 position = region->getPosRegionFromGlobal(hit_object->getPositionGlobal());//regionp->getOriginAgent();
					LLVector3 mypos = region->getPosRegionFromGlobal(gAgent.getPositionGlobal());
			

					LLVector3 delta = position - mypos;
					F32 distance = (F32)delta.magVec();

					line.append(llformat("<%.02f,%.02f,%.02f>",position.mV[0],position.mV[1],position.mV[2]));
					mText.push_back(line);
					line.clear();
					line.append(llformat("Distance: %.02fm",distance));
					mText.push_back(line);
				}
				else
				{
					suppressObjectHoverDisplay = TRUE;
				}
				//  If the hover tip shouldn't be shown, delete all the object text
				if (suppressObjectHoverDisplay)
				{
					mText.clear();
				}
			}
		}
	}
	else if ( mHoverLandGlobal != LLVector3d::zero )
	{
		// 
		//  Do not show hover for land unless prefs are set to allow it.
		// 
		
		if (!gSavedSettings.getBOOL("ShowLandHoverTip")) return; 

BOOL LLToolPlacer::raycastForNewObjPos( S32 x, S32 y, LLViewerObject** hit_obj, S32* hit_face, 
							 BOOL* b_hit_land, LLVector3* ray_start_region, LLVector3* ray_end_region, LLViewerRegion** region )
{
	F32 max_dist_from_camera = gSavedSettings.getF32( "MaxSelectDistance" ) - 1.f;

	// Viewer-side pick to find the right sim to create the object on.  
	// First find the surface the object will be created on.
	LLPickInfo pick = gViewerWindow->pickImmediate(x, y, FALSE);
	
	// Note: use the frontmost non-flora version because (a) plants usually have lots of alpha and (b) pants' Havok
	// representations (if any) are NOT the same as their viewer representation.
	if (pick.mPickType == LLPickInfo::PICK_FLORA)
	{
		*hit_obj = NULL;
		*hit_face = -1;
	}
	else
	{
		*hit_obj = pick.getObject();
		*hit_face = pick.mObjectFace;
	}
	*b_hit_land = !(*hit_obj) && !pick.mPosGlobal.isExactlyZero();
	LLVector3d land_pos_global = pick.mPosGlobal;

	// Make sure there's a surface to place the new object on.
	BOOL bypass_sim_raycast = FALSE;
	LLVector3d	surface_pos_global;
	if (*b_hit_land)
	{
		surface_pos_global = land_pos_global; 
		bypass_sim_raycast = TRUE;
	}
	else 
	if (*hit_obj)
	{
		surface_pos_global = (*hit_obj)->getPositionGlobal();
	}
	else
	{
		return FALSE;
	}

	// Make sure the surface isn't too far away.
	LLVector3d ray_start_global = gAgentCamera.getCameraPositionGlobal();
	F32 dist_to_surface_sq = (F32)((surface_pos_global - ray_start_global).magVecSquared());
	if( dist_to_surface_sq > (max_dist_from_camera * max_dist_from_camera) )
	{
		return FALSE;
	}

// [RLVa:KB] - Checked: 2009-07-10 (RLVa-1.0.0g) | Modified: RLVa-0.2.0f
	// NOTE: don't use surface_pos_global since for prims it will be the center of the prim while we need center + offset
	if ( (gRlvHandler.hasBehaviour(RLV_BHVR_FARTOUCH)) && (dist_vec_squared(gAgent.getPositionGlobal(), pick.mPosGlobal) > 1.5f * 1.5f) )
	{
		return FALSE;
	}
// [/RLVa:KB]

	// Find the sim where the surface lives.
	LLViewerRegion *regionp = LLWorld::getInstance()->getRegionFromPosGlobal(surface_pos_global);
	if (!regionp)
	{
		llwarns << "Trying to add object outside of all known regions!" << llendl;
		return FALSE;
	}

	// Find the simulator-side ray that will be used to place the object accurately
	LLVector3d		mouse_direction;
	mouse_direction.setVec( gViewerWindow->mouseDirectionGlobal( x, y ) );

	*region = regionp;
	*ray_start_region =	regionp->getPosRegionFromGlobal( ray_start_global );
	F32 near_clip = LLViewerCamera::getInstance()->getNear() + 0.01f;  // Include an epsilon to avoid rounding issues.
	*ray_start_region += LLViewerCamera::getInstance()->getAtAxis() * near_clip;

	if( bypass_sim_raycast )
	{
		// Hack to work around Havok's inability to ray cast onto height fields
		*ray_end_region = regionp->getPosRegionFromGlobal( surface_pos_global );  // ray end is the viewer's intersection point
	}
	else
	{
		LLVector3d		ray_end_global = ray_start_global + (1.f + max_dist_from_camera) * mouse_direction;  // add an epsilon to the sim version of the ray to avoid rounding problems.
		*ray_end_region = regionp->getPosRegionFromGlobal( ray_end_global );
	}

	return TRUE;
}

LLVector3d	LLWorld::clipToVisibleRegions(const LLVector3d &start_pos, const LLVector3d &end_pos)
{
	if (positionRegionValidGlobal(end_pos))
	{
		return end_pos;
	}

	LLViewerRegion* regionp = getRegionFromPosGlobal(start_pos);
	if (!regionp) 
	{
		return start_pos;
	}

	LLVector3d delta_pos = end_pos - start_pos;
	LLVector3d delta_pos_abs;
	delta_pos_abs.setVec(delta_pos);
	delta_pos_abs.abs();

	LLVector3 region_coord = regionp->getPosRegionFromGlobal(end_pos);
	F64 clip_factor = 1.0;
	F32 region_width = regionp->getWidth();
	if (region_coord.mV[VX] < 0.f)
	{
		if (region_coord.mV[VY] < region_coord.mV[VX])
		{
			// clip along y -
			clip_factor = -(region_coord.mV[VY] / delta_pos_abs.mdV[VY]);
		}
		else
		{
			// clip along x -
			clip_factor = -(region_coord.mV[VX] / delta_pos_abs.mdV[VX]);
		}
	}
	else if (region_coord.mV[VX] > region_width)
	{
		if (region_coord.mV[VY] > region_coord.mV[VX])
		{
			// clip along y +
			clip_factor = (region_coord.mV[VY] - region_width) / delta_pos_abs.mdV[VY];
		}
		else
		{
			//clip along x +
			clip_factor = (region_coord.mV[VX] - region_width) / delta_pos_abs.mdV[VX];
		}
	}
	else if (region_coord.mV[VY] < 0.f)
	{
		// clip along y -
		clip_factor = -(region_coord.mV[VY] / delta_pos_abs.mdV[VY]);
	}
	else if (region_coord.mV[VY] > region_width)
	{ 
		// clip along y +
		clip_factor = (region_coord.mV[VY] - region_width) / delta_pos_abs.mdV[VY];
	}

	// clamp to within region dimensions
	LLVector3d final_region_pos = LLVector3d(region_coord) - (delta_pos * clip_factor);
	final_region_pos.mdV[VX] = llclamp(final_region_pos.mdV[VX], 0.0,
									   (F64)(region_width - F_ALMOST_ZERO));
	final_region_pos.mdV[VY] = llclamp(final_region_pos.mdV[VY], 0.0,
									   (F64)(region_width - F_ALMOST_ZERO));
	final_region_pos.mdV[VZ] = llclamp(final_region_pos.mdV[VZ], 0.0,
									   (F64)(LLWorld::getInstance()->getRegionMaxHeight() - F_ALMOST_ZERO));
	return regionp->getPosGlobalFromRegion(LLVector3(final_region_pos));
}

LLVector3d	LLWorld::clipToVisibleRegions(const LLVector3d &start_pos, const LLVector3d &end_pos)
{
	if (positionRegionValidGlobal(end_pos))
	{
		return end_pos;
	}

	LLViewerRegion* regionp = getRegionFromPosGlobal(start_pos);
	if (!regionp) 
	{
		return start_pos;
	}

	LLVector3d delta_pos = end_pos - start_pos;
	LLVector3d delta_pos_abs;
	delta_pos_abs.setVec(delta_pos);
	delta_pos_abs.abs();

	LLVector3 region_coord = regionp->getPosRegionFromGlobal(end_pos);
	F64 clip_factor = 1.0;
	F32 region_width = regionp->getWidth();
	if (region_coord.mV[VX] < 0.f)
	{
		if (region_coord.mV[VY] < region_coord.mV[VX])
		{
			// clip along y -
			clip_factor = -(region_coord.mV[VY] / delta_pos_abs.mdV[VY]);
		}
		else
		{
			// clip along x -
			clip_factor = -(region_coord.mV[VX] / delta_pos_abs.mdV[VX]);
		}
	}
	else if (region_coord.mV[VX] > region_width)
	{
		if (region_coord.mV[VY] > region_coord.mV[VX])
		{
			// clip along y +
			clip_factor = (region_coord.mV[VY] - region_width) / delta_pos_abs.mdV[VY];
		}
		else
		{
			//clip along x +
			clip_factor = (region_coord.mV[VX] - region_width) / delta_pos_abs.mdV[VX];
		}
	}
	else if (region_coord.mV[VY] < 0.f)
	{
		// clip along y -
		clip_factor = -(region_coord.mV[VY] / delta_pos_abs.mdV[VY]);
	}
	else if (region_coord.mV[VY] > region_width)
	{ 
		// clip along y +
		clip_factor = (region_coord.mV[VY] - region_width) / delta_pos_abs.mdV[VY];
	}

	// clamp to < 256 to stay in sim
	LLVector3d final_region_pos = LLVector3d(region_coord) - (delta_pos * clip_factor);
	final_region_pos.clamp(0.0, 255.999);
	return regionp->getPosGlobalFromRegion(LLVector3(final_region_pos));
}

LLVector3d	LLWorld::clipToVisibleRegions(const LLVector3d &start_pos, const LLVector3d &end_pos)
{
	if (positionRegionValidGlobal(end_pos))
	{
		return end_pos;
	}

	LLViewerRegion* regionp = getRegionFromPosGlobal(start_pos);
	if (!regionp) 
	{
		return start_pos;
	}

	LLVector3d delta_pos = end_pos - start_pos;
	LLVector3d delta_pos_abs;
	delta_pos_abs.setVec(delta_pos);
	delta_pos_abs.abs();

	LLVector3 region_coord = regionp->getPosRegionFromGlobal(end_pos);
	F64 clip_factor = 1.0;
	F32 region_width = regionp->getWidth();
	if (region_coord.mV[VX] < 0.f)
	{
		if (region_coord.mV[VY] < region_coord.mV[VX])
		{
			// clip along y -
			clip_factor = -(region_coord.mV[VY] / delta_pos_abs.mdV[VY]);
		}
		else
		{
			// clip along x -
			clip_factor = -(region_coord.mV[VX] / delta_pos_abs.mdV[VX]);
		}
	}
	else if (region_coord.mV[VX] > region_width)
	{
		if (region_coord.mV[VY] > region_coord.mV[VX])
		{
			// clip along y +
			clip_factor = (region_coord.mV[VY] - region_width) / delta_pos_abs.mdV[VY];
		}
		else
		{
			//clip along x +
			clip_factor = (region_coord.mV[VX] - region_width) / delta_pos_abs.mdV[VX];
		}
	}
	else if (region_coord.mV[VY] < 0.f)
	{
		// clip along y -
		clip_factor = -(region_coord.mV[VY] / delta_pos_abs.mdV[VY]);
	}
	else if (region_coord.mV[VY] > region_width)
	{ 
		// clip along y +
		clip_factor = (region_coord.mV[VY] - region_width) / delta_pos_abs.mdV[VY];
	}

	// clamp to < 256 to stay in sim
	LLVector3d final_region_pos = LLVector3d(region_coord) - (delta_pos * clip_factor);
	// clamp x, y to [0,256[ and z to [0,REGION_HEIGHT_METERS] (the clamp function cannot be used here)
	if (final_region_pos.mdV[VX] < 0) final_region_pos.mdV[VX] = 0.0;
	if (final_region_pos.mdV[VY] < 0) final_region_pos.mdV[VY] = 0.0;
	if (final_region_pos.mdV[VZ] < 0) final_region_pos.mdV[VZ] = 0.0;
	if (final_region_pos.mdV[VX] > 255.999) final_region_pos.mdV[VX] = 255.999; 
	if (final_region_pos.mdV[VY] > 255.999) final_region_pos.mdV[VY] = 255.999;
	if (final_region_pos.mdV[VZ] > REGION_HEIGHT_METERS) final_region_pos.mdV[VZ] = REGION_HEIGHT_METERS;
	//final_region_pos.clamp(0.0, 255.999);
	return regionp->getPosGlobalFromRegion(LLVector3(final_region_pos));
}