Trouble with cube

OpenGL OpenGL: Basic Coding
1

A newbie question :slight_smile: I tryed to work out a function that making a cube with parameters.
Problem is the cube doesn’t look right. why?
code:
void createRoom(float langd, float hojd, float bredd, GLuint texture_id)
{
glPushMatrix();
glBindTexture ( GL_TEXTURE_2D, texture_id);
glBegin(GL_QUADS);
/front/
glTexCoord2f(1.0f, 0.0f); glVertex3f(0.0f, 0.0f, 0.0f); //bottom left
glTexCoord2f(1.0f, 1.0f); glVertex3f(langd, 0.0f, 0.0f); //bottom right
glTexCoord2f(0.0f, 1.0f); glVertex3f(langd, hojd, 0.0f); // top right
glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f, hojd ,0.0f); //top left
/Back/
glTexCoord2f(0.0f, 0.0f); glVertex3f(langd, 0.0f, bredd); //bottom right
glTexCoord2f(1.0f, 0.0f); glVertex3f(langd, hojd, bredd); //top right
glTexCoord2f(1.0f, 1.0f); glVertex3f(0.0f, hojd, bredd); // top left
glTexCoord2f(0.0f, 1.0f); glVertex3f(0.0f, 0.0f, bredd); //bottom left
/Top/
glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f, hojd, 0.0f); //top left
glTexCoord2f(1.0f, 0.0f); glVertex3f(0.0f, hojd, bredd); //bottom left
glTexCoord2f(1.0f, 1.0f); glVertex3f(langd, hojd,bredd); //bottom right
glTexCoord2f(0.0f, 1.0f); glVertex3f(langd, hojd, 0.0f); //top right
/botten/
glTexCoord2f(1.0f, 0.0f); glVertex3f(langd, 0.0f, 0.0f); //top right
glTexCoord2f(1.0f, 1.0f); glVertex3f(0.0f, 0.0f, 0.0f); //top left
glTexCoord2f(0.0f, 1.0f); glVertex3f(0.0f, 0.0f, bredd); //bottom left
glTexCoord2f(0.0f, 0.0f); glVertex3f(langd, 0.0f, bredd); //bottom right
/Right/
glTexCoord2f(1.0f, 0.0f); glVertex3f(langd, 0.0f, bredd); // bottom right
glTexCoord2f(1.0f, 1.0f); glVertex3f(langd, hojd, bredd); // top right
glTexCoord2f(0.0f, 1.0f); glVertex3f(langd, hojd, 0.0f); // top left
glTexCoord2f(0.0f, 0.0f); glVertex3f(langd, 0.0f, 0.0f); // bottom left
/Left/
glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f, 0.0f, 0.0f); //bottom left
glTexCoord2f(1.0f, 0.0f); glVertex3f(0.0f, 0.0f, bredd); //bottom right
glTexCoord2f(1.0f, 1.0f); glVertex3f(0.0f, hojd, bredd); //top right
glTexCoord2f(0.0f, 1.0f); glVertex3f(0.0f, hojd, 0.0f); //top left

	glEnd();	
glPopMatrix();

}

2

Looked like a cube in my code… What exactly does “doesn’t look right” mean for you?

3

hm, strange, I mean that the sides doesn’t look correct. Some sides seems to invisible and some sides seems to be triangles. But my values have to be correct (wrong order?) cause I wrote it down in an “plane in space” on paper.
Have u tryed to rotate the cube and see if all the sides are perfect?

4

It looks correct from all angles. Invisible faces can be explained with face bulling. All faces of the cube don’t have the same winding order; some faces are ordered clockwise, some counter clockwise. When turning on face culling, some faces will “incorrectly” be culled since they appear in the wrong order.

5

Try drawing the cube without a texture. It could be your texture mapping is wrong.