10 replies to this topic

[njp]

TDF3D game. (*Now open source version available!)

Download v2.4 Open source version (gmk): http://u.filepak.com...urceversion.gmk (check out gmks game info first)
Download v2.4 (exe): http://u.filepak.com...DF3D_v2.4ad.exe
Download v2.1 (exe) :http://u.filepak.com...TDF3Dv2.1ad.exe




Description:
Top down 3d done pure gml without any 3d functions.
Realistic car handling (steering wheel style turning, drifting, force, acceleration, momentum, tire traction)

Scripts:

Spoiler

Car step event script:

Spoiler

//this is still a work in progress so yes it has some bugs and yes its not very organized.
//ill be updating this and adjusting it in the next few versions!

if x>room_width then {x=room_width speed=0} if x<0 then {x=0 speed=0} if y>room_height then {y=room_height speed=0} if y<0 then {y=0 speed=0} //this line makes sure the car doesnt leave the room
if x=obj_player.x{
if y=obj_player.y
{
if global.incar=1 {
if keyboard_check(ord('W')) {{if speed>0 friction=0.01} {if speed>0.5 then l=0} if drift>0 then {speed+=+(acc-(drift/50))} else speed+=+acc} else {{if speed>0.5 { friction=speed/100} else friction=0.01}} //the 'go' button :P, this makes the car accelerate
if keyboard_check(ord('S')) speed+=-acc //puts car in reverse

if speed>0 then turnspeed=(((tsl)-(tsr))/(5.5+l)) //if the car is moving, set the turnspeed, (tsl-tsr) (leave the 5.5 unless you really know what your doing, this is the dividing number which makes it so the car doesnt turn freaky fast, if you want to change the turning speed read up the create event under 'tss')
if speed<0 then turnspeed=-(((tsl)-(tsr))/(5.5+l)) //same as the last line but for reverse, nothing really changed here
image_angle+=+turnspeed //adjust the car angle based on the turning
if speed>0 then {if turnspeed>0 then image_angle+=+(drift) if turnspeed<0 then image_angle+=-(drift)} //makes sure the car drifts in the proper direction, note the variable turnspeed is not actually the 'turning speed' it just holds either a - value for left or a + value for right

if keyboard_check(ord('A')) then {if tsl<tsmax then if speed>0 {tsl+=+tss+(speed/10)} else {tsl+=+tss+(-speed/10)}}//
if keyboard_check(ord('D')) then {if tsr<tsmax then if speed>0 {tsr+=+tss+(speed/10)} else {tsr+=+tss+(-speed/10)}}
if tsl>0 then tsl+=-(tss-0.1)
if tsr>0 then tsr+=-(tss-0.1)//adjusts the turning speed (ts stands for turnspeed)
if tsl<0 then tsl=0
if tsr<0 then tsr=0
if speed<0 then l=0 //the l variable initiates once the car is rolling slowly, to prevent unrealistic turning at very slow speeds.
if speed=0 then { turnspeed=0 speed=0 tsl=0 tsr=0 l=0}//if the speed is 0 the car wont turn
if speed<2 then {if speed>0 {if !keyboard_check(ord('W')) then {if l<6 then l+=+0.175}}} else {if l>0 l+=-0.1}//like i said 2 lines ago, this is the l variable
if speed>maxspeed then speed=maxspeed //limit the car speed
if speed<-maxspeed/1.5 then speed=-maxspeed/1.5 //limit the car speed in reverse
if drift>0 then drift+=-dm //if the car is drifting slowly decrease the drift, change 'dm' var in create event
if speed<-0.5 then friction=-speed/25 //friction of the car in reverse, change the div number (25) lower to increase friction, higher to decrease friction
if speed<0 { if speed>-0.5 {friction=0.01 {if tsl>0 then tsl+=-0.7 if tsr>0 then tsr+=-0.7}}} //if car is below zero but above -0.5 then change the friction and adjust the tsr and tsl

if keyboard_check(vk_space) then {if speed>0 then {speed+=-(speed/divdspeed)} if speed<0 then {speed+=+(-speed/(divdspeed/2))} if drift<speed/4 then drift+=+(speed/4.5)}
speed+=-((drift/100)) //if space is pressed (handbrake) start the drift and adjust the speed based on braking.

if turnspeed>0 speed+=-turnspeed/divspeedturnadj //if the car is turning slightly subtract the speed
if turnspeed<0 speed+=+turnspeed/divspeedturnadj //same as above ^
//gears
if speed>=0 then gear=0 //change the gears depending on the speed of the car
if speed>2 then gear=1
if speed>4 then gear=2
if speed>5 then gear=3
if speed>6 then gear=4
if speed>7 then gear=5
if speed<0 then gear=-1 //-1 is reverse gear
if gear=0 then acc=0.08 //the lower the gear the faster the acceleration
if gear=1 then acc=0.05
if gear=2 then acc=0.04
if gear=3 then acc=0.03
if gear=4 then acc=0.02
if gear=5 then acc=0.015//the higher the gear the slower the acceleration, change these numbers to change the acceleration!

}
}
}
if image_angle>360 then image_angle=0 if image_angle<0 then image_angle=360//these 2 lines here really dont do anything, they just keep the angle values from getting really big or really small, it keeps them within the 360 range, removing these 2 lines wont effect the script at all
if direction>360 then direction=0 if direction<0 then direction=360

direction+= median(-(1.7+((maxspeed-speed)/10)), 1.7+((maxspeed-speed)/10), (((((image_angle-180) - direction) mod 360) + 540) mod 360) - 180)//adjust the direction based on the image angle, this allows for drifting because the directoin adjusts slower than the image_angle does. change the 1.7 variables as needed

draw_sprite_warp:

Spoiler

/*
**  Usage:
**      draw_texture_quad(tex, x1, y1, x2, y2, x3, y3, x4, y4, step)
**
**  Arguments:
**      tex 		texture to draw (sprite/background_get_texture())
**      x1,y1...    the region to draw into
**      step        number of steps for drawing; 1-n the bigger, the smoother less distorted result
**
**  Returns:
**      none
**
**  Notes:
**      Draws a texture quad region from x1,y1 (upper left) to x2,y2 (upper right)
**      to x3,y3 (lower left) to x4,y4 (lower right)
**      Useful for drawing fake 3d perspective looking walls or floors
**
**      Note that GM7 is limited to 1000 vertices. You may have modify the code to split the sequence
**      vertices in use = 2*step+2
**
**  GMLscripts.com
*/

var tex,x1,x2,x3,x4,y1,y2,y3,y3,step;
tex = argument0;
x1 = argument1;
y1 = argument2;
x2 = argument3;
y2 = argument4;
x3 = argument5;
y3 = argument6;
x4 = argument7;
y4 = argument8;
step = argument9;

var w1xs,w1ys,w2xs,w2ys;

w1xs = (x2-x1)/step;
w1ys = (y2-y1)/step;
w2xs = (x4-x3)/step;
w2ys = (y4-y3)/step;

var w1xat,w1yat,w2xat,w2yat;

w1xat = x2;
w1yat = y2;
w2xat = x4;
w2yat = y4;

var us; us = 1/step;
var uat; uat = 1;

var c; c = draw_get_color();
draw_set_color(c_white);
draw_primitive_begin_texture(pr_trianglestrip, tex);
//draw_primitive_begin(pr_trianglestrip);


repeat(step+1)
{
    draw_vertex_texture(w1xat,w1yat,uat,0)
    draw_vertex_texture(w2xat,w2yat,uat,1)
    uat-=us;
    w1xat-=w1xs;
    w1yat-=w1ys;
    w2xat-=w2xs;
    w2yat-=w2ys;
}
draw_primitive_end();
draw_set_color(c);

Yet to come:
-z level, for better environments and adding 'height' to the world.
-fix some car bugs
-better collisions with angle adjustments based on force of impact
-traffic, people, more buildings etc.

I will be releasing an open source version of this for people to learn how to do top down 3d without any 3d functions whatsoever, so stay tuned.
Open source version now released! warning, this is the first open source release, the coding is messy/not organised , but commented for the most part. v3 of the open source will be fully organized, cleaned up, bug ridden, and most likely will be posted under tutorials actually.

If you use this source or anything it contains you must credit NicJamesPanda (njp), however once v3 of the source is released you can use it freely, currently on v2.4.

Enjoy playing the engine
-Nic

Edited by njp, 30 November 2011 - 06:40 PM.

[jmcorp2007]

Very interesting, plays very well. The 3D effects look awesome, especially since you didn't use any d3d functions. Interested in seeing the source code.

[njp]

Very interesting, plays very well. The 3D effects look awesome, especially since you didn't use any d3d functions. Interested in seeing the source code.

thanks for the reply, yup i just have to clean it up a bit, add commenting and basically rewrite most of it since my coding it messy... but messy coding still gets the job done as i see it ^^

Edited by njp, 27 November 2011 - 08:07 AM.

[TheSnidr]

It looks good - however, the lack or foreshortening makes the buildings seem a little like 3d trapezoids rather than blocks. You might want to fix that
The car physics are really good!

Edited by TheSnidr, 27 November 2011 - 08:39 AM.

[Conk]

That's awesome! I'd love to be able to make something like that!
The guy can walk over the red buildings though, just in case you hadn't realised.

[njp]

It looks good - however, the lack or foreshortening makes the buildings seem a little like 3d trapezoids rather than blocks. You might want to fix that
The car physics are really good!

iv noticed that and at the moment i have no fix, and adding that would result in rewriting everything haha maybe if this ever gets to v3 ill add that in.

and thanks, the car physics are what i worked the most on. they are good yes, but their not perfect, so therefor i dont like them. im doing a complete rewrite of the car physics, ill have to read up on more advanced angle calculations.

That's awesome! I'd love to be able to make something like that!
The guy can walk over the red buildings though, just in case you hadn't realised.

simply forgot haha, ill fix that in the next version (right away)

[Bjorn Morrison]

This is fantastic, can't wait to see what else you do with it, and I'll admit I'd love to play around with the source too.

The car can have a tendency to turn on the spot when bumping into things (it feels a bit floaty in these situations) but overall it handles really well. I'd like to see it start to auto-drift when turning at high speeds, not just when you pull the handbrake.

I'm assuming you can't shoot yet (or I couldn't find the key to do that), but running around on foot feels pretty good too.

Great job and please keep posting updates.

Bjorn

[njp]

This is fantastic, can't wait to see what else you do with it, and I'll admit I'd love to play around with the source too.

The car can have a tendency to turn on the spot when bumping into things (it feels a bit floaty in these situations) but overall it handles really well. I'd like to see it start to auto-drift when turning at high speeds, not just when you pull the handbrake.

I'm assuming you can't shoot yet (or I couldn't find the key to do that), but running around on foot feels pretty good too.

Great job and please keep posting updates.

Bjorn

thanks for the feedback and yea ill be completely rewriting the car physics, write now the drifting variable cant be initiated at fast speeds due to the glitchy results, but i will be fixing this problem in the rewrite.
as for the open souce of the fake 3d it will take some time since ill be adding more accessories to the world and even fences when i figure it all out, im learning while i create this most of this was figured out by messing around with bits of code and the collision script i found somewhere on my harddrive :S wish i could give credit i dont remember who helped me with that.

stay tuned once i hit v3 ill have an open source version ready

[Newly Discovered]

unless you are required to use fake 3d, why not just make it 3d?
plus, you can just build your city in blender or the like, and bake shadows, ambient occlusion, and things you really can't get with fake 3d.
if you don't know how to use blender, I suggest learning.
it's really quite simple, just learn a couple shortcut keys, learn how to texture it, baking is extremely easy, and you can have a much better looking game.

oh, as for gameplay thoughts...
overall I liked it. I saw no game breaking bugs, no issues with anything, however I would like to suggest zooming the camera out when you move faster. can you do that with your engine? it is a useful and popular 'feature' in games like this.

Edited by Newly Discovered, 29 November 2011 - 05:34 AM.

[njp]

unless you are required to use fake 3d, why not just make it 3d?
plus, you can just build your city in blender or the like, and bake shadows, ambient occlusion, and things you really can't get with fake 3d.
if you don't know how to use blender, I suggest learning.
it's really quite simple, just learn a couple shortcut keys, learn how to texture it, baking is extremely easy, and you can have a much better looking game.

oh, as for gameplay thoughts...
overall I liked it. I saw no game breaking bugs, no issues with anything, however I would like to suggest zooming the camera out when you move faster. can you do that with your engine? it is a useful and popular 'feature' in games like this.

will consider, im not sure how to do zooming with fake 3d without it effecting the hud tho :S


EDIT:
OPEN SOURCE RELEASED!

Edited by njp, 30 November 2011 - 06:42 PM.

[jmcorp2007]

Any chance of a GM7 open source version?

Tried to use it, but it's not working (was made in a newer version)