Add Half Sphere & Dome to objects

[jpaoneMines]

Half sphere is an open shape.

Dome is a half sphere with a closed disc bottom.

[jpaoneMines]

Half sphere: leverage full sphere but only draw half of it

// full sphere
glDrawArrays( GL_TRIANGLE_FAN, 0, static_cast<GLint>(slices+2) );

    for(GLuint stackNum = 1; stackNum < stacks-1; stackNum++) {
        glDrawArrays( GL_TRIANGLE_STRIP, static_cast<GLint>((slices+2) + (stackNum-1)*((slices+1)*2)), static_cast<GLint>((slices+1)*2) );
    }

    glDrawArrays( GL_TRIANGLE_FAN, static_cast<GLint>((slices+2) + (stacks-2)*(slices+1)*2), static_cast<GLint>(slices+2) );

// half sphere
//glDrawArrays( GL_TRIANGLE_FAN, 0, static_cast<GLint>(slices+2) );

    for(GLuint stackNum = 1; stackNum < (stacks-1)/2; stackNum++) {
        glDrawArrays( GL_TRIANGLE_STRIP, static_cast<GLint>((slices+2) + (stackNum-1)*((slices+1)*2)), static_cast<GLint>((slices+1)*2) );
    }

    glDrawArrays( GL_TRIANGLE_FAN, static_cast<GLint>((slices+2) + (stacks-2)*(slices+1)*2), static_cast<GLint>(slices+2) );

[jpaoneMines]

Flip definitions - half sphere has a cap, dome is open. dome can sit on top of a cylinder and be open all the way through

[jpaoneMines]

Done, ready for commit.

[jpaoneMines]

Commited.