c - How do I transform glOrtho clipping planes? -

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i've created opengl application define viewing volume glortho(). use glulookat() transform points. problem - points fall out of clipping plane because "left behind". , end black screen.

how change viewing volume still tight objects once have been transformed glulookat()?

here's code better illustrate problem:

vector3d eyepos = new vector3d(0.25, 0.25, 0.6); vector3d point = new vector3d(0, 0, 0.001);             vector3d = new vector3d(0, 1,0);             matrix4d mat = matrix4d.lookat(eyepos, point, up);  gl.viewport(0, 0, glcontrol1.width, glcontrol1.height);  gl.matrixmode(matrixmode.projection); gl.loadidentity();   gl.ortho(0, 1, 0, 1, 0, 1);  gl.matrixmode(matrixmode.modelview); gl.loadidentity();    gl.loadmatrix(ref mat); gl.clear(clearbuffermask.colorbufferbit | clearbuffermask.depthbufferbit); gl.enable(enablecap.depthtest); gl.depthmask(true); gl.cleardepth(1.0); gl.color3(color.yellow); gl.begin(primitivetype.triangles); gl.vertex3(0.2, 0.3, 0.01); gl.vertex3(0, 0.600, 0.01); gl.vertex3(0.600, 0.600, 0.01); gl.color3(color.blue); gl.vertex3(0, 0.6, 0.01); gl.vertex3(0.2, 0.3, 0.01); gl.vertex3(0.7, 0.5, 0.03); gl.color3(color.red); gl.vertex3(0.100, 0.000, 0.01); gl.vertex3(0, 0.0, 0.01); gl.vertex3(0.600, 0.600, 0.03);  gl.end(); glcontrol1.swapbuffers();

i suppose more succinct revision of question how transform 2 points lookat matrix?("mat" in code)

okay, got problem.

you set camera position (0.25, 0.25, 0.6) , point @ view direction (-0.25, -0.25, -0.599) (has normalised). mentioned in comment below question, drawing cube in upper right corner of view direction. 2 points (0.25, 0.25, 0.6) (the camera position) , point defined camera position , view direction, vector , right vector (have @ this) define cube of things shown on screen (the 2 points define diagonal within cube). unfortunatly, of points not within cube.

may be, mixed camera position point wanna at? change of 2 values should solve problem. rest of code seems correct. thing have check whether points within clip space of projections. solution check points are, use, e.g. keyboard input, move camera dynamically.


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