So my first time playing this was a bit frustrating, as I got this really weird glitch where the pen would refuse to lock on to surfaces. This left me drawing surreal patterns in the air.  Thought I was playing some sort of avante-garde perspective piece like Superliminal, until I took another look at the gif and went "no. wait. I've broken it."

Rebooting the game fixed it, and I haven't been able to replicate the bug since, so the mystery of all that will haunt me. But moving on.

Fun concept! Took a bit to get used to the drawing controls but once I got the hang of it I could do it consistently. Felt good zipping all over town via the hub dimension and there's real potential there for puzzles or speedrunning. Gravity gets weird and nausea-inducing if you open a portal on the ground though.

In terms of visuals - I'm not sure if this project is going to lean more realistic (like the buildings) or stylistic, but I will say I rather like the gradient effect on the particles and the trees. Placeholder or not there's something charming about it.

Good luck with development! I'd love to see more of this!

I enjoyed it a lot. I thought the mechanics of drawing the door was cool very interesting. I am also a fan of any game that has orbz as they are my mortal enemy. I also loved jumping around on the buildings skyrim style. extra point for aircontrol

This was an interesting demo. My biggest issue is that I was having a hard time drawing the door knob bc of the thickness of the pen. (I also accidentally dropped the green orb inside of a piece of geometry and lost it so I had to reset. That's my fault though.) I'd like to see where this goes if you go further with it.

Cool concept. Impressive tech.

I was trying to draw by holding left and right, then releasing right to draw the door knob. It seems counter intuitive that you release left and hold right, since left raises the finger. Like left is select tool and right is use tool, when in reality it's the other way around.

Also, you could display a cubemap of the room on the portal at a distance to give the impression that it doesn't stop rendering.

DRAWING CLARIFICATION:

Drawing classification is tied to right-click. When you press and hold right-click, everything that you draw before you release right-click will be classified.  Other overlapping drawings may interfere with classification, but won't interfere with corner detection. 

Corner detection relies on the door being drawn in exactly 2 strokes (1 stroke = hold left-click, draw, release left-click) with the first line being the door frame and the second being the door knob. I already have a fix in mind for this, but for the sake of time, I implemented it with these more restrictive mechanics. If you draw a door and the drawing disappears entirely, it should be because you didn't use exactly 2 strokes to draw it. Otherwise, if it doesn't activate, it's because the classifier didn't recognize it.

For anyone curious on how it works:

Drawing classification is done using a Convolutional Neural Network that I trained using drawings of the door rune that I manually drew and saved out in-game. I drew the rune 100 times and then programmatically altered the images slightly (e.g., random rotation, coloration, etc.) to generate 1000s of images of the door rune. I aslo drew hundreds of examples of things that aren't the door rune (e.g., scribbles, squares without knobs, circles). I then trained the classifier to recognize these two classes.  It's definitely not perfect. Ideally I'd have hundreds of thousands of examples from lots of different people to train on.

The corner detection basically just looks at the dot product between three points (i.e., Dot((P1-P0, P2-P1)). This dot product is proportional to the angle between the vectors. If both vectors are normalized, then the result will be between -1 and  +1.  A positive dot product means the two vectors are generally pointing in the same direction and a negative means opposite directions. 0 means that they are perpendicular. Using this I assume that the smallest 4 dot products should correspond with the 4 corners, but this is only true for relatively smooth surfaces.

Sorry for any furstration this may cause. This stuff is very experimental!