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chayanvinayak

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About chayanvinayak

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  1. chayanvinayak

    Loading BMP file using C++

    Hello , Is there any good example code with explanation for loading BMP file for texturing using C++ ? I tried to take a look at Nehe.gamedev.net and they are using some old GLAUX.h which does not exist any more and one of the other video tutorial website does not show how they loaded the bmp files they just showed how to apply loaded bmp file for texturing. Thanks Chayan Vinayak
  2. Hello , Is there any good example code with explanation for loading BMP file for texturing using C++ ? I tried to take a look at Nehe.gamedev.net and they are using some old GLAUX.h which does not exist any more and one of the other video tutorial website does not show how they loaded the bmp files they just showed how to apply loaded bmp file for texturing. Thanks Chayan Vinayak
  3. chayanvinayak

    gluLookAt(z=0) objects z=0 but they r not visible

    Thanks Brother Bob ! that worked, I don't have confusion any more
  4. Hello, I have written a simple program to learn camera, perspective,projection and model_view matrix. In this program : - I am setting the camera to look at (0,0,0) :x=0,y=0,z=0 and placing the camera at (0,0,-20) : x=0,y=0,z=-20 - first I place all the objects at z=0 But they are not visible. They should be visible bcz camera is looking at z=0 and all the objects are at z=0 - as soon as I place objects at z=-2 they get visible. Here is my code : #include <stdio.h> #include <glut.h> int fov = -2; void handleResize(int w, int h){ glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45,double(w)/double(h),1, 100 ); printf("%d\n",fov); gluLookAt(0,0,0,0,0,-20,0,1,0); } void handleKeypress(unsigned char key,int x, int y){ switch(key){ case 27: exit(0); case 56: fov+=2; glutPostRedisplay(); break; case 50: fov-=2; glutPostRedisplay(); break; } printf("Key: %d : Z: %d\n",key,fov); } void init(){ glEnable(GL_DEPTH_TEST); } void drawScene(){ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0f,0.0f,float(fov)); glBegin(GL_POINTS); glVertex3f(20.0f, 20.0f, 0.0f); glEnd(); glBegin(GL_QUADS); glVertex3f(2.0f, 2.0f, 0.0f); glVertex3f(-2.0f, 2.0f, 0.0f); glVertex3f(-2.0f, -2.0f, 0.0f); glVertex3f(2.0f, -2.0f, 0.0f); glEnd(); glutSwapBuffers(); } void main (int argc, char** argv){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH); glutInitWindowSize(400,400); glutCreateWindow("Chayan Vinayak's OpenGL tutorial "); init(); glutDisplayFunc(drawScene); glutKeyboardFunc(handleKeypress); glutReshapeFunc(handleResize); glutMainLoop(); }
  5. chayanvinayak

    gluPerspective() OpenGL

    gluPerspective(45.0,(double)w / (double)h,1.0,200.0); In gluPersepective() function we define near clipping. In most of the cases we define near clipping as 1.0 which means anything which is beyond 1.0 or which has Z co-ordinate value less than 1.0 will not be drawn then why are the primitives or points are drawn or visible in the screen which have -5.0( or any other negative value for Z-axis) eg. glBegin(GL_POINTS); glVertex3f(10.0f, 20.0f, -5.1f); glEnd(); Thanks
  6. chayanvinayak

    Basic OpenGL

    Hello, I am trying to draw a very basic OpenGL program which is supposed to draw a point on the screen. But it is not drawing anything. Following is the code. Thanks #include <stdio.h> #include <glut.h> void handleResize(int w, int h){ glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45,double(w)/double(h),1, 100 ); } void handleKeypress(unsigned char key,int x, int y){ switch(key){ case 27: exit(0); } } void init(){ glEnable(GL_DEPTH_TEST); } void drawScene(){ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glBegin(GL_POINTS); glVertex3f(10.0f, 20.0f, -5.1f); glVertex3f(50.0f, 50.0f, 5.1f); glEnd(); glBegin(GL_QUADS); glVertex3f(10.0f, 20.0f, -5.0f); glVertex3f(50.0f, -50.0f, 5.1f); glVertex3f(-10.0f, 20.0f, -5.1f); glVertex3f(-50.0f, -50.0f, 5.1f); glEnd(); glutSwapBuffers(); } void main (int argc, char** argv){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH); glutInitWindowSize(400,400); glutCreateWindow("Chayan Vinayak's OpenGL tutorial "); init(); glutDisplayFunc(drawScene); glutKeyboardFunc(handleKeypress); glutReshapeFunc(handleResize); glutMainLoop(); }
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