Page 22/36 TGLLines Lines are basically points connected by lines. Points are called nodes here. Lines have Width  with   same   perspective   restrictions   like   points.   Nodes   can   be   visible   or   not   and   can   be represented by cubes, stars or spheres with changeable size. TGLPlane Plane is a single quad. Quad is a polygon composed of four vertices and two triangles. Plane has Width and Height values. Direction of the plane is important.  It points in the direction of normal of the plane. Normal is a vector that tells us which side if front and which side is back. If we look at the plane from the front side we can see it, if we look from the back side we can’t see it. You will be able to see the plane only if it’s direction will point towards the camera. Vertex shading can sometimes create problems with large planes. If edges of the plane are stretched out too far from the reach of lights the plane will become dark as a whole. TGLPolygon [TODO] TGLCube Cube   is   composed   of   six   planes,   each   plane   can   be   disabled.   Cube   has  CubeWidth, CubeHeight and CubeDepth properties. TGLFrustrum Frustrum is a twisted cube with variable size of top and bottom sides. TGLSphere Radius  is the size of the cube,  Segments  specifies how many polygons will be used to draw the cube and how smooth the curvature will be. TGLDisk [TODO] TGLCone [TODO] TGLCylinder [TODO] TGLDodecahedron [TODO] TGLIcosahedron [TODO] Advanced geometry More complicated than basic geometry but the description is the same. GLScene beginner's guide, Jan Zizka, 2005