Why is there a hole on my sphere?

OpenGL OpenGL: Advanced Coding
1

The hole is where the light is directed at. When I rotate the coordinate, it seems I can see through the hole?! However if I switch froM GLU_FILL to GLU_LINE, it looks just fine. I didn’t use any material or texture. Can anyone help?
void __fastcall TMain::CreateLight(GLfloat r, GLfloat g, GLfloat b)
{
m_lightAmb[0]=r; m_lightAmb[1]=g;
m_lightAmb[2]=b; m_lightAmb[3]=1.0f;

m_lightDif[0]=1.0f; m_lightDif[1]=1.0f;
m_lightDif[2]=1.0f; m_lightDif[3]=1.0f;

m_lightSpe[0]=0.8f; m_lightSpe[1]=0.8f;
m_lightSpe[2]=0.8f; m_lightSpe[3]=1.0f;

m_lightPos[0]=1.0f; m_lightPos[1]=.0f;
m_lightPos[2]=-1.0f; m_lightPos[3]=0.0f;

glLightfv(GL_LIGHT0,GL_AMBIENT,m_lightAmb);
glLightfv(GL_LIGHT0,GL_DIFFUSE,m_lightDif);
glLightfv(GL_LIGHT0,GL_SPECULAR,m_lightSpe);
glLightfv(GL_LIGHT0,GL_POSITION,m_lightPos);

glShadeModel(GL_SMOOTH);
glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
}

void __fastcall TMain::AddSphere()
{
GLUquadricObj* quadObj;
glNewList(Sphere,GL_COMPILE);
quadObj=gluNewQuadric();
gluQuadricDrawStyle(quadObj,GLU_LINE);
gluQuadricNormals(quadObj,GLU_SMOOTH);
gluSphere(quadObj,1,8,8);
glEndList();
}

2

This is not an advanced question.
You should read the spec of glLightfv, and maybe you’ll see that it expects to find an array of four floats.

SeskaPeel.

3

Originally posted by SeskaPeel:
This is not an advanced question.
Seskapeel is correct - this shouldn’t be in the advanced forum…

[b]
You should read the spec of glLightfv, and maybe you’ll see that it expects to find an array of four floats.

SeskaPeel.[/b]
You mean like [0], [1], [2] & [3]? As in the code provided? :stuck_out_tongue:

4

Seems like I misread some lines of code …
I may have been answering too fast too :slight_smile:

I’ll have to apologize for that, and ask for more code, because all that’s present here should work fine.

rpgc I hate you :stuck_out_tongue:

SeskaPeel.

5

If the sphere intersects the near clipping plane, it will be, well, clipped. Could be the problem here. Try reducing the radius.

6

Originally posted by SeskaPeel:
[b]rpgc I hate you :stuck_out_tongue:

SeskaPeel.[/b]
You’re welcome. :smiley: