Sorry for asking so many questions, its just that i am so into this now
a days and i encounter a few problems a day. usually they are pretty
simple problems as you can see, but thanks anyway.
okay so i have the following code....
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <iostream>
#include <windows.h>
#include <cstdio>
#include <cstdlib>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <Math.h>
#define PI 3.1415926535898
float zoom = 12.0f;
double angle;
double a=0.0,b=0.0;
void init(void)
{
//glShadeModel(GL_SMOOTH);
//glClearColor (0.0f,0.0f,0.0f,0.5f);
GLfloat mat_specular[]={1.0,1.0,0.0,1.0};
GLfloat light_position[]={3.0,4.0,100.0,0.0};
glClearColor (0.1,0.1,0.1,0.0);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
//glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialf(GL_FRONT, GL_SHININESS, 1000.0);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glColorMaterial(GL_FRONT, GL_DIFFUSE);
glEnable(GL_COLOR_MATERIAL);
}
void glRotatef(
GLfloat angle,
GLfloat x,
GLfloat y,
GLfloat z
);
void drawString (const char *s) //How do display text
{
unsigned int i;
for (i = 0; i < strlen (s); i++)
glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, s[i]);
};
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
//glTranslatef(0,0,-zoom);
glTranslatef(-2,-2,-zoom);
glColor4f(0.2,0.2,1.0,0.0);
glutSolidSphere(1.0,200,16);
glTranslatef(3,4,-zoom);
glColor3f(0.7,0.7,0.0);
glutSolidSphere(1.0,200,16);
glTranslatef(3,4,-zoom);
glColor3f(1.0,0.0,0.0);
glutSolidSphere(1.0,200,16);
glTranslatef(5,9,-20);
glColor3f(1.0,0.6,0.0);
glutSolidSphere(10.0,200,16);
glColor4f(1.0,0.0,0.0,1.0); //LINE HERE
glLineWidth(5.0);
glBegin(GL_LINES);
glVertex3f(-10000,0,10);
glVertex3f(100000,0,10);
glutPostRedisplay();
glEnd();
glTranslatef(a,b,-zoom);
glColor3f(1.0,0.2,0.0);
glutSolidSphere(1.0,200,16);
a-=0.3;
b-=0.3;
glutFullScreen( );
glPopMatrix();
glFlush();
glLoadIdentity();
glutSwapBuffers();
glutPostRedisplay();
}
void reshape( int w, int h)
{
glViewport(0,0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(w<=h)
{
glOrtho(-1.5,1.5,-1.5*(GLfloat)h/(GLfloat)w,
1.5*(GLfloat)h/(GLfloat)w, -10.0,10.0);
}
else
{
glOrtho(-1.5*(GLfloat)w/(GLfloat)h,
1.5*(GLfloat)w/(GLfloat)h, -1.5,1.5,-10.0,10.0);
}
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45,(float)w/h,0.1,100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/*glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45,(float)w/h,0.1,100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();*/
}
void Keyboard(unsigned char key, int x, int y)
{
switch(key)
{
case 27:
exit(0);
break;
default:
break;
}
}
int main(int argc, char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize(1275,955);
glutInitWindowPosition(0,0);
glutCreateWindow("Asteroids");
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(Keyboard);
glutMainLoop();
return 0;
}
and the problem is, where i am drawing a VERY LONG straight line. for
some reason its black and i can't figure it out. i can tell there's a
line there, cause its not the same black that the background is, but
its kind of black. Why is that happening if im setting the color to red?
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Reply
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 lubanfamily (53)
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8/29/2005 1:49:29 AM |
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bballmitch wrote:
> Sorry for asking so many questions, its just that i am so into this now
> a days and i encounter a few problems a day. usually they are pretty
> simple problems as you can see, but thanks anyway.
Lighting affects lines just as much as other primitives, so turn lighting off
if you want a pure red line:
glDisable(GL_LIGHTING);
glColor4f(1.0,0.0,0.0,1.0); //LINE HERE
glLineWidth(5.0);
glBegin(GL_LINES);
glVertex3f(-10000,0,10);
glVertex3f(100000,0,10);
glutPostRedisplay();
glEnd();
glEnable(GL_LIGHTING);
Also, glutFullScreen() should only be called onced durring your GL initialization.
Mike
> okay so i have the following code....
>
> #include <GL/gl.h>
> #include <GL/glu.h>
> #include <GL/glut.h>
> #include <stdlib.h>
> #include <iostream>
> #include <windows.h>
> #include <cstdio>
> #include <cstdlib>
> #include <string.h>
> #include <stdio.h>
> #include <stdarg.h>
> #include <Math.h>
>
> #define PI 3.1415926535898
>
> float zoom = 12.0f;
> double angle;
> double a=0.0,b=0.0;
>
> void init(void)
> {
> //glShadeModel(GL_SMOOTH);
> //glClearColor (0.0f,0.0f,0.0f,0.5f);
> GLfloat mat_specular[]={1.0,1.0,0.0,1.0};
> GLfloat light_position[]={3.0,4.0,100.0,0.0};
> glClearColor (0.1,0.1,0.1,0.0);
> glShadeModel(GL_SMOOTH);
> glEnable(GL_DEPTH_TEST);
> //glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial);
> glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
> glMaterialf(GL_FRONT, GL_SHININESS, 1000.0);
> glLightfv(GL_LIGHT0, GL_POSITION, light_position);
> glEnable(GL_LIGHTING);
> glEnable(GL_LIGHT0);
> glColorMaterial(GL_FRONT, GL_DIFFUSE);
> glEnable(GL_COLOR_MATERIAL);
> }
>
> void glRotatef(
> GLfloat angle,
> GLfloat x,
> GLfloat y,
> GLfloat z
> );
>
> void drawString (const char *s) //How do display text
> {
> unsigned int i;
> for (i = 0; i < strlen (s); i++)
> glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, s[i]);
>
> };
>
>
> void display(void)
> {
> glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
> glPushMatrix();
> //glTranslatef(0,0,-zoom);
>
> glTranslatef(-2,-2,-zoom);
> glColor4f(0.2,0.2,1.0,0.0);
> glutSolidSphere(1.0,200,16);
> glTranslatef(3,4,-zoom);
> glColor3f(0.7,0.7,0.0);
> glutSolidSphere(1.0,200,16);
> glTranslatef(3,4,-zoom);
> glColor3f(1.0,0.0,0.0);
> glutSolidSphere(1.0,200,16);
> glTranslatef(5,9,-20);
> glColor3f(1.0,0.6,0.0);
> glutSolidSphere(10.0,200,16);
>
> glColor4f(1.0,0.0,0.0,1.0); //LINE HERE
> glLineWidth(5.0);
> glBegin(GL_LINES);
> glVertex3f(-10000,0,10);
> glVertex3f(100000,0,10);
> glutPostRedisplay();
glutPostRedisplay() in the middle of a drawing operation? Or maybe that's just
for debugging? Still, GL won't like that.
> glEnd();
>
> glTranslatef(a,b,-zoom);
> glColor3f(1.0,0.2,0.0);
> glutSolidSphere(1.0,200,16);
> a-=0.3;
> b-=0.3;
>
> glutFullScreen( );
>
> glPopMatrix();
> glFlush();
> glLoadIdentity();
> glutSwapBuffers();
> glutPostRedisplay();
> }
>
>
> void reshape( int w, int h)
> {
> glViewport(0,0, (GLsizei) w, (GLsizei) h);
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> if(w<=h)
> {
> glOrtho(-1.5,1.5,-1.5*(GLfloat)h/(GLfloat)w,
> 1.5*(GLfloat)h/(GLfloat)w, -10.0,10.0);
> }
> else
> {
> glOrtho(-1.5*(GLfloat)w/(GLfloat)h,
> 1.5*(GLfloat)w/(GLfloat)h, -1.5,1.5,-10.0,10.0);
> }
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> gluPerspective(45,(float)w/h,0.1,100);
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();
> /*glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> gluPerspective(45,(float)w/h,0.1,100);
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();*/
> }
>
> void Keyboard(unsigned char key, int x, int y)
> {
> switch(key)
> {
> case 27:
> exit(0);
> break;
> default:
> break;
> }
> }
>
> int main(int argc, char** argv)
> {
> glutInit(&argc,argv);
> glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
> glutInitWindowSize(1275,955);
>
> glutInitWindowPosition(0,0);
> glutCreateWindow("Asteroids");
> init();
>
> glutDisplayFunc(display);
> glutReshapeFunc(reshape);
> glutKeyboardFunc(Keyboard);
>
> glutMainLoop();
> return 0;
> }
>
> and the problem is, where i am drawing a VERY LONG straight line. for
> some reason its black and i can't figure it out. i can tell there's a
> line there, cause its not the same black that the background is, but
> its kind of black. Why is that happening if im setting the color to red?
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Reply
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 Mike
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8/29/2005 2:19:03 AM
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thanks for tips. and it worked.
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Reply
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bballmitch
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8/29/2005 2:25:32 AM
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2 Replies
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