Godot: Kinematic character slows down at certain areas

[crym0nster]

Godot version:
3.0 RC1

OS/device including version:
Arch Linux, Linux Mint

Issue description:
Kinematic character with move_and_slide() slows down at certain areas. Walking at marked areas reduces speed ~2 times. Tested on 2 machines with Linux, but on Windows it works well.

Steps to reproduce:
Try attached example

Minimal reproduction project:
test_kinematic_character.zip

[jedStevens]

Was also getting this, had me boggled because I was blaming my code which was for the most part simple, at least the movement was.

Can't confirm if a windows machine runs my project and since it's a larger private one I'm not into sharing but I could make a small example later today, as to what gives me this error

[AndreaCatania]

Is this happening only with bullet physics?

[jedStevens]

In transit atm, but I have not tried godot physics to compare. I will later
today.

On Jan 15, 2018 8:27 AM, "Andrea Catania" [e-mail] wrote:

Is this happening only with bullet physics?

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[volzhs]

I tested this with godot physics. and it stucks at a corner and couldn't move at all

[AndreaCatania]

Is it possible that the problem is the mesh itself, I'll check it soon

[jedStevens]

Potentially, I am using an auto generated mesh.

I'll use a blender made one next. What is best practices for a mesh for
this? Tris / Quads

On Jan 15, 2018 8:32 AM, "Andrea Catania" [e-mail] wrote:

Is it possible that the problem is the mesh itself, I'll check it soon

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[crym0nster]

I also got stuck in a corner with GodotPhysics. There was an error:
ERROR: _initialize_and_check_api_hashes: Mono: Core API hash mismatch!
At: modules/mono/mono_gd/gd_mono.cpp:259.

[AndreaCatania]

You must use mesh composed by triangles, also the best shape type to use is a convex shape instead of a concave one since the solver is more lightweight.
However the concave shape should work perfectly then let me know if it doesn't.

[crym0nster]

I triangulated mesh in Blender and it stopped slowing down on the ramp(the top thing marked red on screenshot), but on the floor - still slowing down. Also on Windows it runs without any problems at all

[crym0nster]

And I tried converting mesh to convex collision shape(selected mesh and on toolbox "create convex static body") - it just created a box enclosing room, but no internal geometry
update: I separated floor from the room and created convex shape for it - now can walk normally on the floor

[AndreaCatania]

It's possible for you to send here the blender file?

[jedStevens]

I can provide my files around noon (Toronto time)

On Jan 15, 2018 9:25 AM, "Andrea Catania" [e-mail] wrote:

It's possible for you to send here the blender file?

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[crym0nster]

blend.zip
the first file is original room - just planes. second - with solidify and triangulate and splitted into several objects

[AndreaCatania]

@crym0nster

Walking at marked areas reduces speed ~2 times.

Do you mean that the FPS drops or do you mean the body velocity slows?
I can't reproduce it on my machines, neither linux nor windows

[crym0nster]

Velocity. I have seen that NPC (also kinematic character) slows down at these areas.

[AndreaCatania]

@crym0nster can you make a video please?

[crym0nster]

yes, I'll try

[crym0nster]

https://www.youtube.com/watch?v=eQ6PhVPDL3g&feature=youtu.be sorry for quality. these numbers - current velocity. normally it should be 35, but it goes to 18 on horizontal plane for some reason

[AndreaCatania]

Ok thanks you i let you know

[AndreaCatania]

I was able to reproduce it, in order to fix it you should increase the safe margin from 0.001 to 0.005 in the kinematic body.

[crym0nster]

Thanks, it works. So was it a bug or not? Because I tried it on Windows and there was no problem with default setting

[AndreaCatania]

The problem was floating point precision, for this reason the margin is customizable

[AndreaCatania]

Remember to close the issue if it's solved, and thanks you for the report