Gideros 3D

MoKaLux · March 2022

Let me create this thread to talk about general Gideros 3D stuff.

I will start with the currently supported 3D formats:
- you can import .obj
- you can import .glb/.gltf
- you can import fbx (with or without animations) through fbxconv
- you can import magicavoxel (new)
- unitypackage

- .vox

All the above supported formats work on all os: android, windows, html5?, cannot tell for other os but should work fine according to forum feedback

~~There is although a catch with .glb:~~
- ~~glb files with embedded image textures ONLY work on desktops~~

~~I am working on it~~ DONE, see post below

MoKaLux · March 2022

MoKaLux said:
There is although a catch with .glb:
- glb files with no image textures (only vertex color) work on all os
- glb files with embedded image textures ONLY work on desktops

I am working on it

Great news, I got it working on my android with the help of hito9

There is the updated 3d-anim sample https://github.com/mokalux/GIDEROS_LUAU_SAMPLES/tree/main/3D-Anim
@hito9 could you please check if it is working now for linux

?

PS: I learnt a bit more about Gideros Buffer https://wiki.gideros.rocks/index.php/Buffer + I updated the wiki https://wiki.gideros.rocks/index.php/File_system as I could understand it

hito9 · March 2022

MoKaLux said:
There is the updated 3d-anim sample https://github.com/mokalux/GIDEROS_LUAU_SAMPLES/tree/main/3D-Anim
@hito9 could you please check if it is working now for linux ?

@MoKaLux, Confirm

, 3D-Anim, 3DDemo1, 3D_Collisions issues has been fixed for Linux too.

MoKaLux said:
PS: I learnt a bit more about Gideros Buffer https://wiki.gideros.rocks/index.php/Buffer + I updated the wiki https://wiki.gideros.rocks/index.php/File_system as I could understand it

Me too thanks to you.

MoKaLux · March 2022

Glad it is working

pull request to gideros GH sent

I got 3d-Anim working on my old samsung S5

PS: reactPhysics3D crashes on me on android

hito9 · March 2022

MoKaLux said:
PS: reactPhysics3D crashes on me on android

Can you post your backtrace log for @hgy29 . As I remember it was easy to debug with Android studio.

MoKaLux · March 2022

yes I am trying this with android studio but I need to find the as plugin to connect my phone via wifi (too lazy to connect it via usb

)

EDIT: FYI here is the debug log for reactphysics3d
2022-03-23 09:42:43.586 5462-5495/? A/libc: Fatal signal 7 (SIGBUS), code 1 (BUS_ADRALN), fault addr 0xc3c8f4ae in tid 5495 (GLThread 3155), pid 5462 (deros.myplayer2)
2022-03-23 09:42:43.642 5534-5534/? E/crash_dump32: unknown process state: t
2022-03-23 09:42:43.701 5534-5534/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
...
2022-03-23 09:42:43.703 5534-5534/? A/DEBUG: pid: 5462, tid: 5495, name: GLThread 3155 >>> com.gideros.myplayer2 2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #00 pc 0007f1b8 /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/libreactphysics3d.so (reactphysics3d::Set, std::__ndk1::equal_to>::add(reactphysics3d::PhysicsWorld* const&)+376) (BuildId: 27861399df68658ff5a6bef14ee8cf8e4ba316a5)
2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #01 pc 0007f010 /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/libreactphysics3d.so (reactphysics3d::PhysicsCommon::createPhysicsWorld(reactphysics3d::PhysicsWorld::WorldSettings const&)+84) (BuildId: 27861399df68658ff5a6bef14ee8cf8e4ba316a5)
2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #02 pc 0002d000 /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/libreactphysics3d.so (BuildId: 27861399df68658ff5a6bef14ee8cf8e4ba316a5)
2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #03 pc 0004f608 /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/liblua.so (BuildId: 3ee4fcbdd4478ca757e431b177f16d920dfcc349)
2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #04 pc 0002c520 /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/liblua.so (BuildId: 3ee4fcbdd4478ca757e431b177f16d920dfcc349)
2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #05 pc 00023ec4 /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/liblua.so (lua_call+36) (BuildId: 3ee4fcbdd4478ca757e431b177f16d920dfcc349)
2022-03-23 09:42:43.946 5534-5534/? A/DEBUG: #06 pc 001483dd /data/app/com.gideros.myplayer2-rKjp2Uokf6LbMgpBUHDttQ==/lib/arm/libgideros.so (BuildId: db5e5e7af1c5709e2476d1cd2a2a1740c01f3421)

I will see what I can get out of this.

MoKaLux · March 2022

I tried to narrow down the error and found it crashes when creating the r3d world:

LevelX = Core.class(Sprite)
 
local r3d = require "reactphysics3d"
 
function LevelX:init()
	-- create r3d physics world
	self.world=r3d.World.new(0, 0, 0) -- CRASH
--	self.world={} -- NO CRASH
	-- some lists to store coming objects (deco, bodies, ...)
	self.world.deco = {}

I am trying to found out how

FYI: r3d doesn't work on html5 as well

MoKaLux · March 2022

I have an issue with r3d and collision detection nothing seems to work

Before I could write this:

g_world:setEventListener(function()
	-- missiles vs enemies collisions
	for k,v in pairs(g_missiles01) do
		for k1,v1 in pairs(g_enemies02) do
			if g_world:testAABBOverlap(v.body, v1.body) then
				g_score += 10
				self.scoretf:setText("SCORE :"..g_score)
				...
			end
		end
	end
	-- player1 vs enemies collisions
	for k,v in pairs(g_enemies02) do
		if g_world:testAABBOverlap(v.body, self.player1.body) then
			self.lives -= 1
			self.livestf:setText("LIVES: "..self.lives)
			...
		end
	end
end)

But this no longer works.
When I try various collision detection (testCollision, testAABBOverlap, testOverlap) I have errors like these:

	-- world listener
	self.world:setEventListener(function() print("xxx") end) -- BUG!?

ERROR: scenes/levelX.lua:74: Failed to step world, something is not set up correctlyhttps://github.com/mokalux/GIDEROS_LUAU_SAMPLES/blob/21b0fea1097ccc02aecc16ea9e7416aa4a72d1a5/R3D_TypeTH/assets/scenes/levelX.lua#L39

function LevelX:player1CollisionCallBack()
	print("player1 down!")
	print(self.tiled_level.player1.view) -- BUG!?
end
		-- test collisions
		self.world:testCollision(v, self.tiled_level.player1.body, self.player1CollisionCallBack) -- BUG!?

ERROR: player1 down!
scenes/levelX.lua:53: attempt to index nil with 'player1'
stack traceback:
scenes/levelX.lua:53: in function player1CollisionCallBack
scenes/levelX.lua:134: in function onEnterFramehttps://github.com/mokalux/GIDEROS_LUAU_SAMPLES/blob/21b0fea1097ccc02aecc16ea9e7416aa4a72d1a5/R3D_TypeTH/assets/scenes/levelX.lua#L134
...

I have a sample project on GH if somebody is willing to have a look: https://github.com/mokalux/GIDEROS_LUAU_SAMPLES/tree/main/R3D_TypeTH

Thank you

MoKaLux · April 2022

I need your insights

How can we use https://wiki.gideros.rocks/index.php/R3d.World:setEventListener ?

From reactbinder.cpp there is:

class GidEventListener: public EventListener {
public:
	lua_State *L;
	int cbn;
	virtual void onContact(
			const CollisionCallback::CallbackData& ci) {
		int nbc=ci.getNbContactPairs();
		for (int k=0;k

But in lua when I try to add this code to 3D Collisions sample code:

r3d=require "reactphysics3d"
 
-- Create physics world
local world=r3d.World.new(0,-9.8,0)
 
-- various collision detection
function collisionsEventListener()
	print("collision")
end
world:setEventListener(collisionsEventListener)

I have this error:
Uploading finished.
main.lua:88: Failed to step world, something is not set up correctly

Anybody

?

hgy29 · April 2022

It is a bug introduced by the switch to luau. I have fixed it for next release.

MoKaLux · April 2022

Thank you hgy29 your fix works fine but I am sorry to tell there are some more bugs? regarding r3d collisions and destroy body? or is it me?

stage:addEventListener(Event.ENTER_FRAME,function(e)
	-- destroy body before world step?
	if box02.body.isdirty then
		box02.body.isdirty = false
		print("box02 is dirty is true, try to destroy it!")
--		world:destroyBody(box02.body) -- CRASH!
	end
...

here is a sample project which crashes gideros player with no information

PS: I tried figuring it out myself but too little experience with c++

MoKaLux · April 2022

and a sample project with testAABBOverlap crash

Sorry to bother guys

hgy29 · April 2022

@MoKaLux, in your first test it crashes because you keep querying the body (body:getTransform()) after having destroyed it. I will try to add more sanity checks to avoid crashing in these cases.

hgy29 · April 2022

@MoKaLux, second test is even easier: testAABBOverlap function isn't implemented

MoKaLux · April 2022

Perfect capitain thank you.

MoKaLux · April 2022

thanks to hgy29 I managed to put a 3d collision 2. I would like to propose it as an additional demo to gideros build?
It demonstrates quite a few steps:
- r3d.Fixture:setMaterial(material)
- destroybody
- move body with arrow keys

It is the same as current 3d collision, so we could also change it with this new demo? What do you think?

MoKaLux · February 2023

there is a memory leak when using Gideros 3dbase files.

When you switch from menu to level the models data are kept in memory and the memory will add up every time you switch from menu to level.

The issue seems to be related to D3Anim, D3, G3DFormat not being freed (even when I nil the models before going to the menu scene)

Do you know how I could prevent the memory leaks, what are the biggest values (tables) that could be nilled?

I have a test file attached.

Thank you for any help

MoKaLux · February 2023

I kinda solved it for my use case, I keep a copy of the models (obj and animated) and reuse them if they exist

self.model = g_oappmodel or loadObj(finalfolder, self.finalfilewithext)
g_oappmodel = self.model

self.model = g_appmodel or buildGdx(self.jsondecoded)
g_appmodel = self.model

Viva Gideros!

MoKaLux · October 2023

Good morning guys

In 3D is there an OpenGL parameter I can tweak so a texture is not hidden by a transparent texture placed above it?
Some images to make more sense

Image 3 is the back view of a 3D wall clock with a texture

Image 2 is the thin glass (semi-transparent) over the wall clock

Image 1 is the front of the wall clock (with the thin glass above it) which hides the texture below it

I don't know if it is has something to do with clipping, an OpenGL setting or ...

Any hints would be much appreciated

, thank you

PS: this is an .obj 3D object rendered through a render target using the 3dbase libraries

PS2: I tried setCullMode but the images are not drawn at all when rotating the object (Sprite.CULL_FRONT, Sprite.CULL_BACK)

hgy29 · October 2023

I don't think this has to do with clipping or alpha, but with depth buffer. Are you always rendering your objects from back to front (relative to the camera) ? Are you using different Z values (so that objects aren't within each other but actually layered) ?

MoKaLux · October 2023

@hgy29 the clock is one .obj file (I merged all the objects into 1) but they each have their own texture. For example the "cadran" has a wood texture, the back face of the clock has its texture, the glass has a semi-transparent texture, ...

So I would say the object (the textures) is rendered from back to top(?) and this relative to the camera (the object can rotate though).

The values for the Z layer (for the object and the textures) should be different, I would say the back of the clock, then the "cadran" then the glass(?).

PS: this happens only with textures. For an .obj car with vertex color (no textures), the car has some windows and I can see through the window (for example the interior of the car)

PaulH · October 2023

I believe hgy29 is exactly right. It's a depth buffer issue. Partially transparent surfaces can be a pain in 3D:

Within the single 3D model the surfaces don't get rendered in an order you can easily rely on. Any surfaces that include transparent areas might occlude surfaces behind it, since the farther surfaces might get rendered after the near ones, and any surface, even one with a transparent texture, will update the depth buffer. That is, it marks that spot on the image as having been drawn at the distance of that surface, and not to bother drawing any surfaces further away on that part of the screen.

What I do to deal with this is make two versions of the model: One that includes all the opaque textures, and one for the transparent ones. Then I load both models, opaque one first, and keep them in the same position and orientation at all times. Then the translucent ones get rendered last.

You could take this further, making it simpler to deal with these kinds of models, by having two children of the 3D scene, added in order: One for all the opaque objects, and one for all the transparent or translucent ones. Then all the the solid objects will be rendered first, and visible through all the translucent ones.

If objects aren't included in the scene in order so the nearest ones are first (which is computationally expensive to maintain if the objects or the camera are moving a lot) then having all the transparencies in one child like that, you would still see some nearer partially transparent surfaces occlude others behind them.

Paul

MoKaLux · October 2023

thank you guys for the information, really appreciated

I now have a better understanding of 3D and depth buffer issue

EDIT: I managed to make it work

What I did was in Blender, instead of merging the objects (clock, wood, needles, glass) I parented them to the wood object (maybe I am lucky that the z order is correct?)

Viva Gideros!

MoKaLux · March 1

Continuing on Gideros and 3D, there is this code which can be nice, I post it for information

https://github.com/ufbx/ufbx

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