EDIT: I fixed it with a few hours of google searching. If anyone could delete/lock the thread that’d be great 
(I hadn’t declared a specific material for those also wondering)
Hello fellow programmers! A couple of months ago I decided that I wanted to learn OpenGl. Finally, I decided to bite the bullet and learn it! Now, I am coding with GLUT and GLEW, but I still felt this would be an appropriate forum to post on, as they ( to my knowledge ) simplify some of the functions. Anyway, to the problem! I just now started fumbling with lighting, and I picked up a very strange problem. The objects seem to be lit fine, but there is a large completely black spot on them. ( both spheres ) Screenshot, and code included below.
- Warning: Please excuse the extreme sloppiness as, this is merely a test of knowledge, not an attempt to write neat code. So it’s kinda all over the place. My apologies
-
#include <GL/glew.h>
#include <GL/glut.h>
#include <cmath>
float locx = 0.0f;
float locy = 0.0f;
float sinAdd = 0.0f;
float planx = 0.0f;
float plany = 0.0f;
void Reshape( int width, int height )
{
glViewport( 0, 0, (GLsizei)width, (GLsizei)height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( 90, (GLfloat)width / (GLfloat)height, 1.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
}
void lightInit( void )
{
GLfloat matSpecular[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat matShininess[] = { 50.0 };
GLfloat lightPos[] = { 0.0, -2.0, -5.0, 0.0 };
glShadeModel( GL_SMOOTH );
glMaterialfv( GL_FRONT_AND_BACK, GL_SPECULAR, matSpecular );
glMaterialfv( GL_FRONT_AND_BACK, GL_SHININESS, matShininess );
glLightfv( GL_LIGHT0, GL_POSITION, lightPos );
glEnable( GL_LIGHTING );
glEnable( GL_LIGHT0 );
}
void drawPlanet( void )
{
locx = ( sin( sinAdd )*3 ) + planx;
locy = ( cos( sinAdd )*3 ) + plany;
glPushMatrix();
glTranslatef( locx, 0.0f, locy );
glutSolidSphere( 0.2, 64, 64 );
glPopMatrix();
sinAdd+= 0.0001f;
}
void drawSun( void )
{
planx = sin( sinAdd );
plany = cos( sinAdd );
glPushMatrix();
glPushAttrib( GL_CURRENT_BIT );
glColor3f( 0.3f, 0.0f, 0.0f );
glTranslatef( 0.0f, 0.0f, 0.0f );
glutSolidSphere( 0.7, 16, 16 );
glPopAttrib();
glPopMatrix();
}
void Display( void )
{
glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glLoadIdentity();
glTranslatef( 0.0f, -2.0f, -10.0f );
drawPlanet();
drawSun();
//drawMoon();
glutSwapBuffers();
}
int main( int argc, char **argv )
{
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH );
glEnable( GL_DEPTH );
glEnable( GL_COLOR_MATERIAL );
glutInitWindowSize( 1024, 900 );
glutInitWindowPosition( 200, 100 );
glutCreateWindow( "Orbital Sim" );
lightInit();
glutDisplayFunc( Display );
glutIdleFunc( Display );
glutReshapeFunc( Reshape );
glutMainLoop();
}