Tileset Scene & CollisionPolygon2D

apb1963

I'm trying to follow this tutorial: http://docs.godotengine.org/en/stable/tutorials/2d/using_tilemaps.html#introduction I've reached the point where it says "Finally, edit the polygon, this will give the tile a collision."

I've run into essentially 5 issues and questions. Please note how his grid changes from large to tiny, but no mention of doing so other than to "use snap" which is of course not what does it, nor do I know how far he zoomed so I can match his screenshot. Further, if in fact I do zoom to make the grid squares smaller, the object of course shrinks with it - unlike his screenshot. So there's some magic going on nobody is talking about. How did he shrink (zoom) the grid, yet enlarge the sprite unless he changed its scale?

Also, his node/object is not centered and fits within one of the large grid squares. Mine is centered and consequently spans 4 squares.

My poly-points will not follow the outline of the rectangle. I had considered zooming to match his screenshot and then drawing the points, but since the object shrunk with the grid I figure it's better that I ask for the right way to go about this instead of guessing.

Also, I'm unable to delete the points, when I try I get: ERROR: _decompose_in_convex: Convex decomposing failed! At: scene/2d/collision_polygon_2d.cpp:128.

Finally there's the warning mentioned in the screenshot, I have no idea how to fix it or what exactly it's telling me other than the obvious which is not very helpful to a beginner.

Thank you in advance!

apb1963

The image didn't come out for some reason. Here it is again.

apb1963

I should probably also mention that the polypoints that I couldn't delete, deleted themselves when I exited and restarted Godot. So, that issue is gone as so far that error hasn't reappeared (not that I've tried). However, all the other issues remain. The most important one is my poly-points will not follow the outline of the rectangle. Any help? Thank you in advance.

PaulMurray

You can set the grid size in the editor. At the top of the editor viewport, click Edit > Configure Snap… and set your grid step settings to match your tile size. Alternatively make the step half the size of your if you want to add polygon anchor points to the midpoints of your tiles (for angles, etc).

To offset your tiles so they're not centred, click on your Tilemap node and look for Tile Origin. If this is set as 'Center', change it to Top Left. Now the origin point of your tile should be its top left corner rather than its midpoint.

The error you see is the one that pops up when you haven't yet defined a Polygon shape inside your CollisionPolygon2D node. I'd ignore it as it should disappear when you create one.