Gmod Minecraft - Physics From Mesh Issues

[thelastpenguin]

[B]Explination of Project (To give you a general understanding of what I want to do)[/B]
In gmod minecraft I'm using a perlin noise based algorithm to procedural generate terrain as players move around allowing them to explore a massive flat-grass sized world (I plan to make maps infiniate at later points, but that would further complicate the existing physics issues). While all of this is great and working perfectly IMesh rendering is relatively easy since one can easily pass triangles to the rendering system and they get drawn, physics however have proven to be quite another problem.

[B]For more info on the project see: [url]http://facepunch.com/showthread.php?t=1272317[/url][/B]

[B]The Problem: Physics[/B]
When attempting physics I modified my mesh building system to build simplified meshes with lower detail etc to make it nicer (and faster for the physics system) and to allow it to run both client and server side (allowing for predction to work properly). I have managed to get a system where each 8 by 8 by 8 block chunk is represented by a single entity with a physics mesh built for it based on the blocks in the are it represents. Players are able to collide with this physics mesh as do props, the problem comes when, however, players try to move ontop of these meshes. Players imediately become stuck on the surfaces unable to move, jump, or do just about anything, simply stuck on the surfaces.

Does anyone have any suggestions or solutions?

I understand this is an extremely challenging problem and have provided the code I am using below, anyone able to help me find a solution to this problem will get credits in the gamemode.

[B]THE CODE[/B]
(this is in an entity)
mesh_builder.lua

AddCSLuaFile()

module( "physmesh_builder", package.seeall )

Vertices = {}
scale = 10

local up    = Vector( 0, 0, 1 )
local front = Vector( 0, 1, 0 )
local right = Vector( 1, 0, 0 )

function Start( )
	Vertices = {}
end
function SetScale( _scale )
	scale = _scale
end

function InsertQuad( top_left, top_right, bottom_right, bottom_left )
	table.insert( Vertices, { pos = bottom_right } )
	table.insert( Vertices, { pos = top_right } )
	table.insert( Vertices, { pos = bottom_left } )
	
	table.insert( Vertices, { pos = top_right } )
	table.insert( Vertices, { pos = top_left } )
	table.insert( Vertices, { pos = bottom_left } )
end

function AddBlock( pos )
	InsertQuad( pos + up, pos + up + right, pos + up + right + front, pos + up + front ) -- top.
	InsertQuad( pos + right, pos, pos + front, pos + right + front ) -- bottom quad.
	InsertQuad( pos + up, pos + up + front, pos + front, pos ) -- left quad.
	InsertQuad( pos + right + up + front, pos + right + up, pos + right, pos + right + front ) -- right quad.
	InsertQuad( pos + front + up, pos + front + up + right, pos + front + right, pos + front ) -- front quad.
	InsertQuad( pos + up + right, pos + up, pos, pos + right ) -- back quad.
end	

function End()
	for k,v in pairs( Vertices )do
		if( v.pos )then
			v.pos = v.pos * scale
		else
			PrintTable( Vertices )
			print("VERTEX:" )
			PrintTable( v )
			return nil
		end
	end
	return Vertices
end

init.lua

include('shared.lua')
AddCSLuaFile('cl_init.lua')
AddCSLuaFile('shared.lua')
include("mesh_physics.lua")

function ENT:Initialize()

	self:SetModel("models/props_junk/PopCan01a.mdl")
	self.Model = "models/props_junk/PopCan01a.mdl"


	self:PhysicsInit(SOLID_CUSTOM)
	self:GetPhysicsObject():EnableMotion( false )
	self:SetMoveType(MOVETYPE_PUSH)
	self:SetSolid(SOLID_VPHYSICS)

	self:SetCustomCollisionCheck(true)

	//self:DrawShadow( false )

	self:SetAngles( Angle( 0, 0, 0 ) )
	self:SetNoDraw( false )

	self:GetPhysicsObject():SetMass(500)
	
	self:GetPhysicsObject():EnableMotion( false )
end

//Build the mesh for the specific segment
//This function is NOT controller only, call it on the segment you want to update the mesh on
function ENT:BuildMesh( x, y, z, w, l, h )
	if( self.Initialized )then return end
	
	physmesh_builder.Start()
	physmesh_builder.SetScale( MC.BlockSize )
	self:_BuildPhysicsMeshTBL( x, y, z, w, l, h )
	local mesh_tbl = physmesh_builder.End()
	if( not mesh_tbl or #mesh_tbl == 0 or #mesh_tbl % 3 ~= 0 )then
		print("MESH TBL COUNT NOT MULTIPLE OF 3 OR = 0 COUNT IS: "..#mesh_tbl )
		return
	end

	self:SetAngles( Angle( 0, 0, 0 ) )
	self:PhysicsFromMesh( mesh_tbl, true ) //THIS MOTHERFUCKER
	self:GetPhysicsObject():EnableMotion( false )
	self:EnableCustomCollisions( )

	self:SetCustomCollisionCheck(true)
end

shared.lua

ENT.Type 			= "anim"
ENT.Base 			= "base_anim"
ENT.PrintName		= "Minecraft physics mesh"
ENT.Author			= "TheLastPenguin"
ENT.Model			= Model( "models/hunter/blocks/cube1x1x1.mdl" )


function ENT:SetupDataTables()
	self:NetworkVar("Int", 0, "block_x")
	self:NetworkVar("Int", 1, "block_y")
	self:NetworkVar("Int", 2, "block_z")
end

function ENT:Think()
	if( not self.PhysInited and self.dt.block_x and self.dt.block_y and self.dt.block_z )then
		self:BuildMesh( self.dt.block_x, self.dt.block_y, self.dt.block_z, MC.ChunkSize, MC.ChunkSize, MC.ChunkSize )
		self.PhysInited = true
	end
end

function ENT:_BuildPhysicsMeshTBL( gx, gy, gz, w, l, h )
	for x = 0, w - 1 do
		local ox = gx + x
		for y = 0, l - 1 do
			local oy = gy + y
			for z = 0, h - 1 do
				local oz = gz + z
				local block = MC.GetBlock( ox, oy, oz )
				if( block and block ~= 0 and MC.BlockIsVisible( ox, oy, oz ) )then
					physmesh_builder.AddBlock( Vector( x, y, z ) ) -- add the block to our physics.
				end
			end
		end
	end
end

cl_init.lua

include('shared.lua')
include("mesh_physics.lua")

ENT.RenderGroup 	= RENDERGROUP_TRANSLUCENT

function ENT:Initialize()
	
end

function ENT:BuildMesh( x, y, z, w, l, h)
	print("BUILDIN MESH!")
	physmesh_builder.Start()
	physmesh_builder.SetScale( MC.BlockSize )
	self:_BuildPhysicsMeshTBL( x, y, z, w, l, h )
	local mesh_tbl = physmesh_builder.End()
	if( not mesh_tbl or #mesh_tbl == 0 or #mesh_tbl % 3 ~= 0 )then
		print("MESH TBL COUNT NOT MULTIPLE OF 3 OR = 0 COUNT IS: "..#mesh_tbl )
		print("     POS: ", x,y,z,w,l,h )
		return
	end
	/*for i=1, #mesh_tbl do
		mesh_tbl[i].pos = mesh_tbl[i].pos - self:GetPos()
	end*/

	self:PhysicsFromMesh( mesh_tbl, true ) //THIS MOTHERFUCKER
	self:EnableCustomCollisions( )
	self:GetPhysicsObject():EnableMotion( false )
	self:GetPhysicsObject():SetMass(500)
	self:SetMoveType(MOVETYPE_NONE)
	self:SetSolid(SOLID_VPHYSICS)
end

[Jcw87]

[QUOTE=thelastpenguin;40951904][B]Explination of Project (To give you a general understanding of what I want to do)[/B]
In gmod minecraft I'm using a perlin noise based algorithm to procedural generate terrain as players move around allowing them to explore a massive flat-grass sized world (I plan to make maps infiniate at later points, but that would further complicate the existing physics issues). While all of this is great and working perfectly IMesh rendering is relatively easy since one can easily pass triangles to the rendering system and they get drawn, physics however have proven to be quite another problem.

[B]For more info on the project see: [url]http://facepunch.com/showthread.php?t=1272317[/url][/B]

[B]The Problem: Physics[/B]
When attempting physics I modified my mesh building system to build simplified meshes with lower detail etc to make it nicer (and faster for the physics system) and to allow it to run both client and server side (allowing for predction to work properly). I have managed to get a system where each 8 by 8 by 8 block chunk is represented by a single entity with a physics mesh built for it based on the blocks in the are it represents. Players are able to collide with this physics mesh as do props, the problem comes when, however, players try to move ontop of these meshes. Players imediately become stuck on the surfaces unable to move, jump, or do just about anything, simply stuck on the surfaces.

Does anyone have any suggestions or solutions?

I understand this is an extremely challenging problem and have provided the code I am using below, anyone able to help me find a solution to this problem will get credits in the gamemode.

*code*[/QUOTE]

I suspect your problem may stem from using MOVETYPE_NONE on the client. Try MOVETYPE_NOCLIP or MOVETYPE_PUSH.

Also, you need to do this on the client as well, or prediction could be wonky

self:SetModel("models/props_junk/PopCan01a.mdl")
self:PhysicsInit(SOLID_CUSTOM)

[thelastpenguin]

[B]SOLVED thanks to Jcw87[/B]

Thanks so much for your help! that solved the problem. I can now run around and jump on my beautiful terrain. Now that this hurtle is overcome I expect to have a beta server up and running in a few weeks :

Now to start water...