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Hello I hope someone can help me with this.

I am trying to make a room which the player will be able to turn full 360 degrees.
Something like the box that Bee-Ant made but one the player is inside, not outside.
Well what I can't figure out is how to make the room turn. I have the coordinates of the
corners but what do I need to do with them to make them rotate? It could be easier without the
perspective messing it up. If I just could get the corners to rotate correctly I am quite sure I could
make the whole thing to work.

Here is picture that shows what corner I should for example to get rotated (with all others of course )
Oh and that pacman is currently in the middle of the room. (The room continues a little out of the screen. )


EDIT: The problem is that the corners don't settle to a circle but ellipse. It makes it much harder (for me at least)...


Thanks in advance!

Something like this?
http://dl.dropbox.com/u/3997355/Demo/3D ... lipses.ged
The control is arrow keys
I have made this over a year ago as experiment

Well, something like that..
Your example just doesn't have the perspective in it and the
shape of the room is a little skewed..

The room won't appear like this in reality:

The roof and the floor should be a little flatter.

And if this had perspective the corners behind should be closer to each other than the
ones in front of.

And well I still can't understand the math.
I guess that's where I need the most help. What do I even need to calculate to get
the corners to fit right on the ellipse? It is very difficult for me to understand where I should start
from..

But thank you anyway, Bee!

Sorry, I just posted that sucked demo without doing any modification first.

No need to be sorry
It just seems that what I'm trying to do is very hard to achieve..

Well in your first post it says that the main problem for you is that the room is an ellipse instead of a circle. Is this the only problem you have with this? If it is, then you should just do the room as a circle but use the trig of an ellipse.

http://en.wikipedia.org/wiki/Ellipse#Ge ... etric_form

If not then well, maybe that helps somehow?

This is a code of an old program of mine (Visual3D, 1993).
I think this can help you.

Code: Select all

double d = 100; //Perspective distance (you must adjust this value)
double scale = 1; //Object size
int center_x = 500, center_y = 500; //the center of the canvas/screen (view.width / 2, view.height / 2, for example)
double teta_x= 0.8 , teta_y = 0.8; //Vision angle (radians)

void line3d(double x1, double y1, double z1, double x2, double y2, double z2)
{
   double x3d_x1,y3d_y1,z3d_z1,x3d_x2,y3d_y2,z3d_z2;
   double vector_y3d_x1,vector_y3d_y1,vector_y3d_x2,vector_y3d_y2;
   double p1,p2,pers1,pers2;
   LONG point_x_x1,point_y_y1,point_x_x2,point_y_y2;
   
   
   x3d_x1 = x1*scale;
   y3d_y1 = y1*scale;
   z3d_z1 = z1*scale;
   
   x3d_x2 = x2*scale;
   y3d_y2 = y2*scale;
   z3d_z2 = z2*scale;
   
   /* Perspective !!! */
   
   
   p1 = z3d_z1*sin(teta_y)*cos(teta_x)+y3d_y1*sin(teta_x)*cos(teta_y)+x3d_x1*cos(teta_x)*cos(teta_y);
   p2 = z3d_z2*sin(teta_y)*cos(teta_x)+y3d_y2*sin(teta_x)*cos(teta_y)+x3d_x2*cos(teta_x)*cos(teta_y);
   
   p1 = (d+p1)*((d+p1)/d);
   p2 = (d+p2)*((d+p2)/d);
   
   pers1 = ((d+p1)/d)/2;
   pers2 = ((d+p2)/d)/2;
   
   vector_y3d_x1 = center_x+pers1*y3d_y1*scale_x*cos(teta_x);
   vector_y3d_y1 = center_y+pers1*y3d_y1*scale_y*sin(teta_x)*sin(teta_y);
   
   vector_y3d_x2 = center_x+pers2*y3d_y2*scale_x*cos(teta_x);
   vector_y3d_y2 = center_y+pers2*y3d_y2*scale_y*sin(teta_x)*sin(teta_y);
   
   point_x_x1 = vector_y3d_x1-pers1*x3d_x1*scale_x*sin(teta_x);
   point_y_y1 = (vector_y3d_y1+pers1*x3d_x1*scale_y*sin(teta_y)*cos(teta_x))-pers1*z3d_z1*scale_y*cos(teta_y);
   
   point_x_x2 = vector_y3d_x2-pers2*x3d_x2*scale_x*sin(teta_x);
   point_y_y2 = (vector_y3d_y2+pers2*x3d_x2*scale_y*sin(teta_y)*cos(teta_x))-pers2*z3d_z2*scale_y*cos(teta_y);
   
   //Some draw function
   draw(point_x_x2,point_y_y2);
}


makslane wrote:This is a code of an old program of mine (Visual3D, 1993).
I think this can help you.

Code: Select all

double d = 100; //Perspective distance (you must adjust this value)
double scale = 1; //Object size
int center_x = 500, center_y = 500; //the center of the canvas/screen (view.width / 2, view.height / 2, for example)
double teta_x= 0.8 , teta_y = 0.8; //Vision angle (radians)

void line3d(double x1, double y1, double z1, double x2, double y2, double z2)
{
   double x3d_x1,y3d_y1,z3d_z1,x3d_x2,y3d_y2,z3d_z2;
   double vector_y3d_x1,vector_y3d_y1,vector_y3d_x2,vector_y3d_y2;
   double p1,p2,pers1,pers2;
   LONG point_x_x1,point_y_y1,point_x_x2,point_y_y2;
   
   
   x3d_x1 = x1*scale;
   y3d_y1 = y1*scale;
   z3d_z1 = z1*scale;
   
   x3d_x2 = x2*scale;
   y3d_y2 = y2*scale;
   z3d_z2 = z2*scale;
   
   /* Perspective !!! */
   
   
   p1 = z3d_z1*sin(teta_y)*cos(teta_x)+y3d_y1*sin(teta_x)*cos(teta_y)+x3d_x1*cos(teta_x)*cos(teta_y);
   p2 = z3d_z2*sin(teta_y)*cos(teta_x)+y3d_y2*sin(teta_x)*cos(teta_y)+x3d_x2*cos(teta_x)*cos(teta_y);
   
   p1 = (d+p1)*((d+p1)/d);
   p2 = (d+p2)*((d+p2)/d);
   
   pers1 = ((d+p1)/d)/2;
   pers2 = ((d+p2)/d)/2;
   
   vector_y3d_x1 = center_x+pers1*y3d_y1*scale_x*cos(teta_x);
   vector_y3d_y1 = center_y+pers1*y3d_y1*scale_y*sin(teta_x)*sin(teta_y);
   
   vector_y3d_x2 = center_x+pers2*y3d_y2*scale_x*cos(teta_x);
   vector_y3d_y2 = center_y+pers2*y3d_y2*scale_y*sin(teta_x)*sin(teta_y);
   
   point_x_x1 = vector_y3d_x1-pers1*x3d_x1*scale_x*sin(teta_x);
   point_y_y1 = (vector_y3d_y1+pers1*x3d_x1*scale_y*sin(teta_y)*cos(teta_x))-pers1*z3d_z1*scale_y*cos(teta_y);
   
   point_x_x2 = vector_y3d_x2-pers2*x3d_x2*scale_x*sin(teta_x);
   point_y_y2 = (vector_y3d_y2+pers2*x3d_x2*scale_y*sin(teta_y)*cos(teta_x))-pers2*z3d_z2*scale_y*cos(teta_y);
   
   //Some draw function
   draw(point_x_x2,point_y_y2);
}


Wow thank you Makslane!
I have to try this code! Thanks very much!