show Virtual area selection

Devidian · Dec 4th 2025

Hey i currently try to show a virtual area but its not what i like it should be....

Ok first i tried

player.enableAreaSelectionTool(false);

player.setAreaSelectionData(area);

but i dont want to have the selection tool activated, just show the area. If i then call

player.disableAreaSelectionTool();

the selection is invisible again... i tried many things but could not get it as i like it.

Only once it closely behaved like i wanted it, but that was after many plugin reloads and gm switches.
After relog it was not behaving like i wanted it again.

UPDATE:

I've managed to to a trick to get it working like i want it to:

if (!player.hasAttribute("selectionToolHack")) {
player.setAttribute("selectionToolHack", true);
player.enableAreaSelectionTool(false);
player.enableAreaSelectionTool(false);
player.disableAreaSelectionTool();
}

If i call enable twice and disable afterwards the visibility seems to stay but the selectiontool stays disabled. This is not as elegant as i was looking for but still its working for now. I only need to do this hack once a session so i added a player attribute.

james1bow · Dec 5th 2025

What exactly are you trying to do? if i understand you want to show the selected area after the tool is disabled? if so use Area3D.

Java

//assuming you already the the Area data(start/end positions)
Area3D area3d = new Area3D(area);
area3d.setAlwaysVisible(true);
player.addGameObject(area3d);

Devidian · Dec 5th 2025

Its for my current plugin im working on Land Claim - (i started it for the Java version but never finished it before the unity news).

Its an option to turn on borders of the current chunk, if the player moves to another chunk with active option the virtual border is updated to the chunk he enters.

The player does not need to set any area, its calculated from the chunk he enters, so in theory the tool is not even needed but if i do not activate it, the area is not shown.

Your way is good to know but i think i would have to (re)move it somehow if the player moves or disables this feature.

edit: Ii just walked through the javadoc, maybe i can use setAttribute to store a ref to the area3d too, so i can update it on change or remove it precisely.

Devidian · Dec 5th 2025

The docs say addGameObject should not be called so often, so i tried to update the Area3D object but it seems not to update it actually

Java

    public void updateVirtualAreaFrameForPlayer(Player player, Area area) {
        Area3D chunkBorderArea = ((Area3D) player.getAttribute("virtualAreaFrame"));
        if (area == null) {
            if (chunkBorderArea != null) {
                player.removeGameObject(chunkBorderArea);
                player.deleteAttribute("virtualAreaFrame");
                player.sendTextMessage("debug:> virtualAreaFrame removed");
            }
            return;
        }
        if (chunkBorderArea == null) {
            chunkBorderArea = new Area3D(area);
            // chunkBorderArea.setAlwaysVisible(true);
            chunkBorderArea.setColor(borderColor);
            chunkBorderArea.setFrameColor(frameColor);
            chunkBorderArea.setFrameVisible(true);
            player.setAttribute("virtualAreaFrame", chunkBorderArea);
            player.addGameObject(chunkBorderArea);
            player.sendTextMessage("debug:> virtualAreaFrame added");
        } else {
            // Nullpointer exception on setStartPosition
            // Area current = chunkBorderArea.getArea();
            // current.setStartPosition(area.getStartPosition());
            // current.setEndPosition(area.getEndPosition());
            // chunkBorderArea.setArea(current);
            chunkBorderArea.setArea(area);

            player.sendTextMessage("debug:> virtualAreaFrame updated");
        }
    }

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Devidian · Dec 5th 2025

Some exceptions i got while testing:

Code

java.lang.NullPointerException: Cannot read field "handle" because "net.risingworld.api.objects.Area.INFINITE" is null
    at net.risingworld.api.objects.Area.destroy(Area.java:393)

java.lang.NullPointerException: Cannot read field "handle" because "net.risingworld.api.objects.Area.INFINITE" is null
    at net.risingworld.api.objects.Area.setStartPosition(Area.java:307)

java.lang.NullPointerException: Cannot read field "handle" because "net.risingworld.api.objects.Area.INFINITE" is null
    at net.risingworld.api.objects.Area.set(Area.java:328)

Im not sure (joking) but a public static final field should not be NULL ? red51

james1bow · Dec 5th 2025

it looks like the methods to update the area3d position do not work. not sure of the impact on performance but removing them is the only way i could get it to work.

Java

@EventMethod
    public void playerConnect(PlayerConnectEvent event){
        event.getPlayer().setAttribute("Enabled", false);
    }

    @EventMethod
    public void playerCommand(PlayerCommandEvent event){
        String[] cmd = event.getCommand().split(" ");
        Player player = event.getPlayer();
        if (cmd[0].equalsIgnoreCase("/enable")) {
            Boolean enabled = (Boolean)player.getAttribute("Enabled");
            if(enabled){
                player.setAttribute("Enabled", false);
                Area3D area3D = (Area3D) player.getAttribute("Area3D");
                player.removeGameObject(area3D);
            }else{
                player.setAttribute("Enabled", true);
                enable(player);
            }
        }
    }

    public void enable(Player player){
        Vector3i ChunkPosition = player.getChunkPosition();
        Vector3i startBlock = new Vector3i(0, 0, 0);
        Vector3i endBlock = new Vector3i(32, 64, 32);
        Vector3i startChunk = new Vector3i(ChunkPosition.x, ChunkPosition.y, ChunkPosition.z);
        Vector3i endChunk = new Vector3i(ChunkPosition.x, ChunkPosition.y, ChunkPosition.z);
        Vector3f startPos = Utils.ChunkUtils.getGlobalPosition(startChunk, startBlock);
        Vector3f endPos = Utils.ChunkUtils.getGlobalPosition(endChunk, endBlock);
        Area newArea = new Area(startPos, endPos);
        Area3D area3D = new Area3D(newArea);
        area3D.setFrameColor(0,0,1,0.5f);
        area3D.setColor(0,0,1,0.5f);
        area3D.setFrameVisible(true);
        player.setAttribute("Area3D", area3D);
        player.addGameObject(area3D);
    }

    @EventMethod
    public void enterChunk(PlayerEnterChunkEvent event){
        Player player  = event.getPlayer();
        Boolean enabled = (Boolean)player.getAttribute("Enabled");
        if(enabled) {
            Vector3i ChunkPosition = event.getNewChunkCoordinates();
            Vector3i startBlock = new Vector3i(0, 0, 0);
            Vector3i endBlock = new Vector3i(32, 64, 32);
            Vector3i startChunk = new Vector3i(ChunkPosition.x, ChunkPosition.y, ChunkPosition.z);
            Vector3i endChunk = new Vector3i(ChunkPosition.x, ChunkPosition.y, ChunkPosition.z);
            Vector3f startPos = Utils.ChunkUtils.getGlobalPosition(startChunk, startBlock);
            Vector3f endPos = Utils.ChunkUtils.getGlobalPosition(endChunk, endBlock);
            Area newArea = new Area(startPos, endPos);
            Area3D area3D = (Area3D) player.getAttribute("Area3D");
            player.removeGameObject(area3D);
            updateArea(player, newArea);
        }
    }

    public void updateArea(Player player, Area area){
        Area3D newArea3D = new Area3D(area);
        newArea3D.setFrameColor(0,0,1,0.5f);
        newArea3D.setColor(0,0,1,0.5f);
        newArea3D.setFrameVisible(true);
        player.setAttribute("Area3D", newArea3D);
        player.addGameObject(newArea3D);
    }

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Devidian · Dec 5th 2025

yes it seems so, i did it too, marked it as workaround in the comments. For now its ok to work with.

BTW this is my method to create the area:

Java

    /**
     * Converts a chunk coordinate into an Area
     */
    public static Area getVirtualAreaFromChunkVector(Vector3i chunkPosition) {
        Vector3f chunkOrigin = new Vector3f(chunkPosition.x * 32, chunkPosition.y * 64, chunkPosition.z * 32);
        Vector3f chunkMax = new Vector3f(chunkOrigin.x + 31.999f, chunkOrigin.y + 63.999f, chunkOrigin.z + 31.999f);
        Area area = new Area(chunkOrigin, chunkMax);

        area.setName("Chunk " + chunkPosition.toString());
        area.setNameVisible(true);
        area.setDefaultPermission("ozlc-guest");
        return area;
    }

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And i call it like this:

Java

    @EventMethod
    public void onPlayerEnterChunkEvent(PlayerEnterChunkEvent event) {
        Player player = event.getPlayer();
        Vector3i oldChunkPos = event.getOldChunkCoordinates();
        Vector3i chunkPos = event.getNewChunkCoordinates();

        logger().debug("Player " + player.getName() + " entered chunk " + chunkPos.toString()
                + " from chunk " + oldChunkPos.toString());

        chunkClaimUtil.leaveChunk(player, oldChunkPos);
        chunkClaimUtil.enterChunk(player, chunkPos);

        // if player has "showVirtualAreaFrame" enabled, show chunk area
        if (player.hasAttribute("showVirtualAreaFrame")) {
            Area area = ChunkClaimUtil.getVirtualAreaFromChunkVector(chunkPos);
            updateVirtualAreaFrameForPlayer(player, area);
        }
    }

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Devidian · 2025-12-16T22:15:32+01:00

area.destroy() is also causing NullpointerException red51 because area.INFINITE is null

james1bow · 2025-12-16T22:21:27+01:00

i noticed this before the last update. happen when i destroyed an area a player was in.

Devidian · 2025-12-16T22:39:59+01:00

ok, good to know but for my LC plugin the player usually is in the zone that is released=destroyed. Maybe thats the same reason why set and the other methods are not working and throwing that exception. I'll try to get a workaround for that, thanks for the hint james.✅

show Virtual area selection

Post by james1bow (Dec 5th 2025).

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