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wanted to share my working player/camera control action C++ app
#224422
08/30/08 00:30
08/30/08 00:30
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Joined: Aug 2008
Posts: 61
Neurosys
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Junior Member
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OP
Junior Member
Joined: Aug 2008
Posts: 61
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I've never seen anyone compile a working example of all the major problem areas faced by beginners such as myself. Namely, camera control, player control, animation and trigonometry. So now That I've met all my milestones with this little prototype, I'm quite pleased to share my code in its complete form more accurately illustrating(i hope) the ways these things can be successfully implemented. I wish I'd have had something like this, well.. when I started making this. I hope it demonstrates well enough for some other people like me to overcome some of their theory obstacles. I wrote this in C++ using the engine SDK (not making a dll). It spawns a wmb with a terrain entity and a playermodel entity. real simple stuff. it assigns the function playercode to the player entity and tells the engine to hit it every frame (just like an action). Thats where the simple stuff ends. The player code action/function seizes control of the camera, puts the camera behind the player a bit above it very 3rd person mmo looking. it follows the players position,height, pan,etc... if you click and hold the left mouse button, you get free cam mode orbiting the player with full 360 rotation along the x axis and about 100 degrees up and down tilt. letting go lets the camera drift smoothly back to its default position. holding down the right mouse button lets you control the players pan with mouse_force.x with the camera following along of course, holding both left and right makes the player move forward,play walk animation and still control the pan AND STILL move the cam freely as before. Of course, all that can be changed to fit the particular your application's needs for any variation of those effects. scrolling the mouse wheel doesnt zoom by changing the camera.arc anymore (basically narrowing and widening the focal width) but rather increments and decrements the camera distance playerskill by small intervals. since the camera distance playerskill value is directly implemented into the orbit/rotation formula it fits beautifully and works perfectly to provide a realistic and smooth zooming effect without altering the focal width but by actually moving the camera along intermittent orbit tracks. Gravity also works. oh yea... w,s forward,back a,d turn left,right ESC = sys_exit
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include "adll.h" // Include the engine data types, variables, and functions
#include "mtlFX.h"
//Prototypes
var rad2deg(float radians);
float deg2rad(var degrees);
var abz(var val);
//Globals
ENTITY* terrain1;
ENTITY* playermodel;
ENTITY* skycube;
BMAP* mcursor;
TEXT* tDebug;
PANEL* pDebug;
var abz(var val) {
var retval;
if (val >= _VAR(0)) { return val; }
retval = _VAR(0) - val;
return retval;
}
float deg2rad(var degrees) {
float deg2rad = (float)(degrees / 57.29578);
return deg2rad;
}
var rad2deg(float radians) {
var rad2deg = _VAR(radians * 57.29578);
return rad2deg;
}
//Function Definitions
void player_code() {
ENTITY *my;
my =(ENTITY *)ev->me;
ev->player = my; // I'm the player
VECTOR* move_vec =_vec(0,0,0);
VECTOR* temp_vec =_vec(0,0,0);
var distance_to_ground;
//Calculate Movement
move_vec->x = (v(key_w) - v(key_s))* 0.015 * v(time_step); // move player on x axis
move_vec->y = 0;//(v(key_a) - v(key_d)) * 0.025 *v(time_step); // move player on y axis
my->pan-= (v(key_d) - v(key_a)) * 0.02 * v(time_step);
//Read Forces
if (v(mouse_left)) {
my->skill[0] += (v(mouse_force).x * 0.02 * v(time_step));
my->skill[6] += (v(mouse_force).y * 0.02 * v(time_step));
if ( my->skill[0] < _VAR(-360) ) { my->skill[0] += _VAR(360); }
if ( my->skill[0] > _VAR(360) ) { my->skill[0] -= _VAR(360); }
if ( my->skill[6] <= _VAR(-89) ) { my->skill[6] = _VAR(-90); }
if ( my->skill[6] >= _VAR(9) ) { my->skill[6] = _VAR(10); }
} else {
if (my->skill[0] < _VAR(0)) { my->skill[0]+= 3 * v(time_step); }
if (my->skill[0] > _VAR(0)) { my->skill[0]-= 3 * v(time_step); }
if (my->skill[0] > _VAR(-1) && my->skill[0] < _VAR(1) ) { my->skill[0]=0; }
if (my->skill[6] < _VAR(-61)) { my->skill[6]+= 3 * v(time_step); }
if (my->skill[6] > _VAR(-59)) { my->skill[6]-= 3 * v(time_step); }
if (my->skill[6] < _VAR(-61) && my->skill[6] > _VAR(-59) ) { my->skill[6]=-60; }
}
if (v(mouse_right)) {
my->pan-= v(mouse_force).x * 0.02 * v(time_step);
if( v(mouse_left) ){
move_vec->x = _VAR(2) * 0.015 * v(time_step); // move player on x axis
}
}
my->skill[3] -=v(mickey).z*0.0001; //Calc Zoom Distance
//Calculate Z Axis Gravity And Move Player
vec_set(temp_vec,(VECTOR*)&my->x);
temp_vec->z -= _VAR(5000); //Set to 5000 below player
distance_to_ground = c_trace((VECTOR*)&my->x,temp_vec, _VAR(IGNORE_ME | USE_BOX));
if (distance_to_ground != 0) {
move_vec->z = -(distance_to_ground - _VAR(25));
move_vec->z = maxv(_VAR(-35) * v(time_step),move_vec->z);
}
c_move(me,move_vec,_vec(0,0,0),GLIDE); // function to actually move player, with GLIDE collision
//Animate As Needed
if (v(key_w) == OFF && v(key_s) == OFF) {
if(v(mouse_left) && v(mouse_right)){
ent_animate(my, "Walka", my->skill[5], ANM_CYCLE);
} else {
ent_animate(my, "Standa", my->skill[5], ANM_CYCLE);
}
} else {
ent_animate(my, "Walka", my->skill[5], ANM_CYCLE);
}
my->skill[5] += 6 * v(time_step);
my->skill[5] = my->skill[5]%_VAR(100);
//Move The Camera
if (abz(my->skill[0]) >= _VAR(0) && abz(my->skill[0]) < _VAR(90)) {
vec_set((VECTOR*)&v(camera).x,vector(my->x -(my->skill[3] * cosv(my->pan + my->skill[0])),my->y -(my->skill[3] * sinv(my->pan + my->skill[0])),my->z+_VAR(my->skill[4])));
} else if (abz(my->skill[0]) > _VAR(90) && abz(my->skill[0]) < _VAR(180)) {
vec_set((VECTOR*)&v(camera).x,vector(my->x -(my->skill[3] * -cosv(_VAR(180)-(my->pan + my->skill[0]))),my->y -(my->skill[3] * sinv(_VAR(180)-(my->pan + my->skill[0]))),my->z+_VAR(my->skill[4])));
} else if (abz(my->skill[0]) > _VAR(180) && abz(my->skill[0]) < _VAR(270)) {
vec_set((VECTOR*)&v(camera).x,vector(my->x -(my->skill[3] * -cosv(_VAR(180)-(my->pan + my->skill[0]))),my->y -(my->skill[3] * sinv(_VAR(180)-(my->pan + my->skill[0]))),my->z+_VAR(my->skill[4])));
} else if (abz(my->skill[0]) > _VAR(270) && abz(my->skill[0]) < _VAR(360)) {
vec_set((VECTOR*)&v(camera).x,vector(my->x -(my->skill[3] * cosv(my->pan + my->skill[0])),my->y -(my->skill[3] * sinv(my->pan + my->skill[0])),my->z+_VAR(my->skill[4])));
}
if (my->skill[6] < _VAR(0) && my->skill[6] > _VAR(-90)) {
v(camera).z=my->z - my->skill[4] * sinv(my->tilt + my->skill[6]);
} else if (my->skill[6] > _VAR(0) && my->skill[6] < _VAR(90)) {
v(camera).z=my->z - my->skill[4] * sinv(_VAR(180)-(my->tilt + my->skill[6]));
}
//Keep Eye On Player After Moving
vec_set(temp_vec,(VECTOR*)&my->x);
vec_sub(temp_vec,(VECTOR*)&v(camera).x);
temp_vec->z+=40;
vec_to_angle((ANGLE*)&v(camera).pan,temp_vec);
}
//WINMAIN!!!OMFGZ!!!
// application instance handle, // always zero // application command line // window flags
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd) {
ev = engine_open(NULL);
if (!ev) return 1; // acknex.dll not found
//Add Content Folders Paths
add_folder("terrains");
add_folder("images");
add_folder("models");
add_folder("code");
level_load("dh.wmb");
engine_frame();
//Initialize The Graphics Environment
video_set(_VAR(1280),_VAR(1024),_VAR(32),_VAR(0));
//Setup The Worldscape
terrain1 = ent_for_name("terrain0x0");
playermodel = ent_for_name("playermodel"); //These two are placed in the level by wed. This will change. Maybe. I hate wed.
//Ready The Player
playermodel->x=0;
playermodel->y=0;
playermodel->z=_VAR(550);
//Init player skills
playermodel->skill[0] = 0; //thetax
playermodel->skill[1] = 0; //tempforcex
playermodel->skill[2] = 0; //tempforcey
playermodel->skill[3] = 180; //Camera Distance
playermodel->skill[4] = 70; //Camera Height
playermodel->skill[5] = 0; //Player Animation Percent
playermodel->skill[6] = -60; //thetay
playermodel->event=(EVENT)player_code;
playermodel->emask |= DYNAMIC;
playermodel->emask |= ENABLE_FRAME;
//Wait for the player to materialize
while(ev->player == NULL) { engine_frame(); }
//Move Camera to Player And Look at the fucker
vec_set((VECTOR*)&v(camera).x,_vec(-180,0,70));
vec_rotate((VECTOR*)&v(camera).x,(ANGLE*)&v(player).pan);
vec_add((VECTOR*)&v(camera).x,(VECTOR*)&v(player).x);
v(camera).pan = v(player).pan;
//Stall For A Frame (add more if ur compy sux0rz)
engine_frame();
//Make a Pretty Sky
skycube = (ENTITY *)ent_createlayer("skycube+6.tga", _VAR(SKY | CUBE | VISIBLE), _VAR(0));
//Bring Up The Mouse
mcursor = bmap_create("brokenarrow.pcx");
ev->mouse_map = mcursor;
v(mouse_mode)=2;
//GUI time
tDebug = txt_create(_VAR(5),_VAR(1));
tDebug->pos_x = _VAR(200);
tDebug->pos_y = _VAR(200);
tDebug->flags |= VISIBLE;
pDebug = pan_create("digits(0,10,\"TEMPFORCEX: \",*,0,NULL); \
digits(70,10,4,*,1,player.skill2); \
digits(0,20,\"TEMPFORCEY: \",*,0,NULL);\
digits(70,20,4,*,1,player.skill3); \
digits(140,10,\"THETA X: \",*,0,NULL); \
digits(230,10,4,*,1,player.skill1); \
digits(310,10,\"THETA Y: \",*,0,NULL); \
digits(410,10,4,*,1,player.skill7); \
digits(140,20,\"Camera Distance: \",*,0,NULL); \
digits(230,20,4,*,1,player.skill4); \
digits(140,30,\"Camera Height: \",*,0,NULL); \
digits(230,30,4,*,1,player.skill5); \
digits(0,40,\"PLAYER X: \",*,0,NULL);\
digits(70,40,4,*,1,player.x); \
digits(0,50,\"PLAYER Y: \",*,0,NULL);\
digits(70,50,4,*,1,player.y); \
digits(0,60,\"PLAYER Z: \",*,0,NULL);\
digits(70,60,4,*,1,player.z); \
digits(140,40,\"Camera X: \",*,0,NULL);\
digits(230,40,4,*,1,camera.x); \
digits(140,50,\"Camera Y: \",*,0,NULL);\
digits(230,50,4,*,1,camera.y); \
digits(140,60,\"Camera Z: \",*,0,NULL);\
digits(230,60,4,*,1,camera.z); \
digits(140,120,\"AnimPercent: \",*,0,NULL);\
digits(230,120,4,*,1,player.skill6); \
digits(0,90,\"MOUSELEFT: \",*,0,NULL);\
digits(70,90,4,*,1,mouse_left); \
digits(0,100,\"MOUSERIGHT: \",*,0,NULL);\
digits(70,100,4,*,1,mouse_right);",_VAR(1));
pDebug->flags |= VISIBLE;
pDebug->pos_x = _VAR(600);
pDebug->pos_y = _VAR(200);
//Main Loop
while (engine_frame()) {
//Main Loop
v(mouse_pos).x = v(mouse_cursor).x;
v(mouse_pos).y = v(mouse_cursor).y;
if (v(key_esc)) { sys_exit(""); }
}//Main Loop
engine_close();
return 0;
}
Hope It Helps Someone, Wish I'd Have Had It, Neurosys
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Re: wanted to share my working player/camera control action C++ app
[Re: Max_Prower]
#232039
10/18/08 23:30
10/18/08 23:30
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Joined: Aug 2008
Posts: 61
Neurosys
OP
Junior Member
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OP
Junior Member
Joined: Aug 2008
Posts: 61
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Thanks for the help, guys but I'm a beginner, I don't understand all those codes and stuff. ^^; Would there be any basic scripts to just hold down a button and drag a target model in a certain direction? You should examine C-Script and Lite-C for this. 3DGS comes with several templates for doing what you describe. This example is for those utilizing the engine SDK and C++ not litec, For instance you might return to the Higher langauges section once you are more familiar with litec usage and have gained an aptitude for c++ endeavors, which are for achieving slightly more complex amount of application control.
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Re: wanted to share my working player/camera control action C++ app
[Re: KiwiBoy]
#265659
05/13/09 14:43
05/13/09 14:43
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Joined: Jan 2009
Posts: 38
Anonymous2009
Newbie
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Newbie
Joined: Jan 2009
Posts: 38
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