React Physics 3D

MoKaLux · December 2020

Let me create this post to share my progress with gideros and react physics 3d and animations.
What I have done:
-imported a 3d model from mixamo to blender to gideros
-animated it in gideros
-built a level with Tiled (from a top down view perspective)
-you control the player with arrow keys

What is left:
-"writing" a class for each type of shape I would like (plane, cube, circle, ...)
-"writing" a class to import obj or fbx
-adding other characters (why always enemies)
-I don't want to make it an FPS (I am a peaceman)
-but he needs to throw something (pebbles?)
-...
-always having fun

I try to keep GH up to date: https://github.com/mokalux/gideros-3D-FP

hgy29 · December 2020

Great to see 3D projects progressing with Gideros. I am progressing on my own lander game too, I'll post another video soon. While looking for tools to create terrains for 3D games, I discovered a great free tool: TerreSculptor. http://www.demenzunmedia.com/home/terresculptor/
It is usable with any engine, even Gideros of course.

MoKaLux · December 2020

great I am downloading it see what I can do to help building my world

Thank you hgy29

MoKaLux · December 2020

~~I can't seem to use materials anymore in gideros r3d. According to the r3d 0.8 official doc this should still work~~:
Now we need to call get and set material on the fixture:

-- materials
--local mat = view.body:getMaterial() -- default: bounciness = 0.5, frictionCoefficient = 0.3, rollingResistance = 0
local mat = fixture:getMaterial() -- default: bounciness = 0.5, frictionCoefficient = 0.3, rollingResistance = 0
mat.bounciness = 0.1
mat.frictionCoefficient = 0.5
mat.rollingResistance = 0.1 -- 0 = no resistance, 1 = max resistance
fixture:setMaterial(mat)

~~Will try to update wiki asap~~DONE.

MoKaLux · December 2020

~~I have a problem~~SOLVED

How can I apply 2 matrices to 1 object? 1 matrix to apply position/rotation and the other matrix to apply scale?

function LevelX:onEnterFrame(e)
	local matrix2
	for k, v in pairs(self.world.dynamicbodies) do
		matrix2 = v.body:getTransform()
		k:setMatrix(matrix2)
--		k:setPosition(v.matrix:getPosition())
--		k:setRotation(v.matrix:getRotation())
		k:setScale(v.matrix:getScale()) -- PROBLEM
	end
end

The code above almost works but:
-when I comment the line PROBLEM the ball rolls but has wrong scale
-when I uncomment the line PROBLEM the ball doesn't roll but has correct scale

How would you go about it please?

One solution would be to implement R3d.Body:getTransform() to return the scale of the body along the position and rotation values. That would be cool! https://wiki.gideros.rocks/index.php/R3d.Body:getTransform

Another solution was to modify the sphere class to add a radius to it:

local Sphere3Db=Core.class(Mesh3Db)
 
function Sphere3Db:init(radius, steps)
	local va,ia={},{}
	local rs=(2*3.141592654)/steps
	local i,ni=4,1
	--Vertices
	va[1]=0 va[2]=1 va[3]=0
	for iy=1,(steps//2)-1 do
		local y=math.cos(iy*rs) * radius
		local r=math.sin(iy*rs) * radius
		for ix=0,steps do
			local x=r*math.cos(ix*rs)
			local z=r*math.sin(ix*rs)
			va[i]=x i+=1
			va[i]=y i+=1
			va[i]=z i+=1
		end
	end
	va[i]=0	va[i+1]=-1 va[i+2]=0
	local lvi=i//3+1
	--Indices
	--a) top and bottom fans
	for i=1,steps do
		ia[ni]=1 ni+=1 ia[ni]=i+1 ni+=1 ia[ni]=i+2 ni+=1
		ia[ni]=lvi ni+=1 ia[ni]=lvi-i ni+=1 ia[ni]=lvi-i-1 ni+=1
	end
	--b) quads
	for iy=1,(steps//2)-2 do
		local b=1+(steps+1)*(iy-1)
		for ix=1,steps do
			ia[ni]=b+ix ni+=1 ia[ni]=b+ix+1 ni+=1 ia[ni]=b+ix+steps+1 ni+=1
			ia[ni]=b+ix+steps+1 ni+=1 ia[ni]=b+ix+1 ni+=1 ia[ni]=b+ix+steps+2 ni+=1
		end
	end
	self:setGenericArray(3,Shader.DFLOAT,3,lvi,va)
	self:setVertexArray(va)
	self:setIndexArray(ia)
	self._steps=steps
	self._va=va self._ia=ia
end

There is a little "hole" at the bottom of my spheres but that's ok, now my spheres roll like gideros rocks.

MoKaLux · December 2020

~~I have a problem~~

I have some fbx files with apparently more than one textures embeded. They produce:
"attributes": [
"POSITION", "NORMAL", "COLOR", "TEXCOORD0", "TEXCOORD1", "TEXCOORD2", "TEXCOORD3", "TEXCOORD4",
"TEXCOORD5", "TEXCOORD6", "TEXCOORD7", "BLENDWEIGHT0", "BLENDWEIGHT1", "BLENDWEIGHT2", "BLENDWEIGHT3"
],

only TEXCOORD0 is recognised by gideros 3DGdxLoader. I tried to add the other TEXCOORD ~~but that doesn't seem to work (I don't see my fbx in the scene)~~.

	for _,a in ipairs(gm.attributes) do		
		if a=="POSITION" then as=3 an="v"
		elseif a=="NORMAL" then as=3 an="n"
		elseif a=="COLOR" then as=4 an="c"
		elseif a=="TEXCOORD0" then as=2 an="t"
-- fix?
		elseif a=="TEXCOORD1" then as=2 an="t"
		elseif a=="TEXCOORD2" then as=2 an="t"
		elseif a=="TEXCOORD3" then as=2 an="t"
		elseif a=="TEXCOORD4" then as=2 an="t"
		elseif a=="TEXCOORD5" then as=2 an="t"
		elseif a=="TEXCOORD6" then as=2 an="t"
		elseif a=="TEXCOORD7" then as=2 an="t"
-- fix?
		elseif a:sub(1,11)=="BLENDWEIGHT" then as=2 an="bw"..a:sub(12,12)
		else assert(false, "Attribute not handled:"..a) end
		attrs[an]={ ab=ds, al=as, d={} }
		ds+=as
	end

Do you know if the above code is valid?
EDIT: that seems to work

I have lost my texture though will try to find where the texture is (ps: it is animated too).

GH updated

MoKaLux · December 2020

ok that was all fun and stuff but I am stuck building my levels

I tried to look at some programs to build them but found Tiled to be the best so far. I build my level from a top down view but that's not a problem at all.

The biggest issue I have is attaching collision shapes to my meshes. For example I have some houses scattered around the level and I would like the player to be able to enter those.

My process was placing the mesh houses with no collision in a Tiled layer then on another ~~level~~ layer I was adding the collision for the walls, that works but it takes tooooo long to do.

Another solution would be to build the houses from parts (walls, roof, doors, ...) and build them by hand but that seems complicated too

I need to give it some time and get back to it later. In the meantime I had the idea to make a 3d platformer

That seems feasible, it should be a mario like 2d platformer but in 3d

I think I have everything I need: gideros - Tiled - reactphysics3d - animation

Wish me luck and a nice YT serie should I succeed.

Viva gideros!

MoKaLux · April 2021

Where do I find reactphysics3d files in gideros GH?
I am looking for this r3d file: ContactSolverSystem.cpp
more precisely this line: if (mContactPoints[contactPointIndex].penetrationDepth > SLOP) biasPenetrationDepth = -(beta/mTimeStep) *
or even this file? reactphysics3d/reactphysics3d.h

They are hidden somewhere

Thank you

hgy29 · April 2021

You can find them here: https://github.com/gideros/reactphysics3d

MoKaLux · February 2022

I updated my r3d gideros project to latest gideros 2022.1.3b and I am happy to share it on github https://github.com/mokalux/GIDEROS_LUAU_SAMPLES

Feel free to ask any questions, I will try to answer

You control the character (the female from the gideros 3d sample) with IJKL + W to jump. The level is built using Tiled (available in the repo). I am looking forward to enhance it

Viva Gideros Luau!

PS: at hgy29 I would like to make it an official demo in a future Gideros release with your permission of course

hito9 · February 2022

I got this error with a newly Build.Linux but there may be a incomplete job when compiling on my side
DELETED

MoKaLux · February 2022

@hito9 I think you got the wrong github repo. I believe the one you posted screenshot of was r3d project using previous Gideros (2021.11). For the latest r3d demo using Gideros 2022.1.3b are you using this repo: https://github.com/mokalux/GIDEROS_LUAU_SAMPLES ? Lua shaders were rewritten for luau.

PS: I barely know any shaders programming so cannot help on this side, sorry

hito9 · February 2022

MoKaLux said:
the latest r3d demo using Gideros 2022.1.3b are you using this repo: https://github.com/mokalux/GIDEROS_LUAU_SAMPLES ? Lua shaders were rewritten for luau.

Yes, your are right. The Luau version of your project worked fine

Keep up doing good work.

hgy29 · March 2022

MoKaLux said:
at hgy29 I would like to make it an official demo in a future Gideros release with your permission of course

With great pleasure of course. Tell me when it is ready to turn into an example, I'll grab a copy and integrate it into Gideros

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