3D graph drawing algorithm

Hey bebi. It's very simple. Let's say u need to draw line between 2 points in 3d. 1st point: x1, y1, z1. 2nd point: x2, y2, z2. Camera 0, 0, 0.

int x1Screen = (int)(x1/z1*SCREEN_X_SIZE/2 + (SCREEN_X_SIZE/2));

int y1Screen = (int)(y1/z1*SCREEN_X_SIZE/2 + (SCREEN_X_SIZE/2));

int x2Screen = (int)(x2/z2*SCREEN_X_SIZE/2 + (SCREEN_X_SIZE/2));

int xyScreen = (int)(y2/z2*SCREEN_X_SIZE/2 + (SCREEN_X_SIZE/2));

Then just draw 2d line using Graphics class. Good luck. Have a question? Feel free to luck. I am mega mind in 3d gfx. U know...

MaxJusta at 2007-7-16 13:14:25 >

So, the formula would be:

int xScreen = (int)((x-xCam)/(z-zCam)*X_SCREEN_SIZE/2+(Y_SCREEN_SIZE/2));

int yScreen = (int)((y-yCam)/(z-zCam)*SCREEN_X_SIZE/2+(SCREEN_Y_SIZE/2));

Is this correct? Because I think in the formula you posted that considers the cam, the second SCREEN_X should be SCREEN_Y?

To which direction is the camera looking in this formula (anlge: x,y,z)?

R. Hollenstein

r.hollensteina at 2007-7-16 13:14:25 >

Hi MaxJust,

It sounds like you are just the person to help me out here.

I have a graphing requirement to render a data set in the same way as you can in Excel, using a 3d surface render.

I am a little stuck as to how to accomplish this. Say for example my data set is something like this:

1Y2Y3Y

1M11.417.918.9

2M12.618.519.5

3M13.718.919.8

4M16.519.920.6

I will assume my X are rows and Y are columns and Z is the value. I could calculate the X and Y using the screen size / number of points I think.

I saw your algorithm earlier in the group, I was wondering how I would apply that to this data set?

Cheers,

Steve

S_P_Ga at 2007-7-16 13:14:25 >