Point Lists

Point Lists A point list is a collection of vertices that are rendered as isolated points. Your application can use them in 3-D scenes for star fields, or dotted lines on the surface of a polygon. Applications create a point list by filling an array of vertices.

[C++]

The following C++ code fragment illustrates the process of constructing a point list.

const DWORD TOTAL_VERTS=6;
D3DVERTEX lpVerts[TOTAL_VERTS];
 
lpVerts[0] = D3DVERTEX(D3DVECTOR(-5,-5,0),D3DVECTOR(0,0,-1),0,0);
lpVerts[1] = D3DVERTEX(D3DVECTOR(0,5,0),D3DVECTOR(0,0,-1),0,0);
lpVerts[2] = D3DVERTEX(D3DVECTOR(5,-5,0),D3DVECTOR(0,0,-1),0,0);
lpVerts[3] = D3DVERTEX(D3DVECTOR(10,5,0),D3DVECTOR(0,0,-1),0,0);
lpVerts[4] = D3DVERTEX(D3DVECTOR(15,-5,0),D3DVECTOR(0,0,-1),0,0);
lpVerts[5] = D3DVERTEX(D3DVECTOR(20,5,0),D3DVECTOR(0,0,-1),0,0);

Render the point list using the IDirect3DDevice7::DrawPrimitive method. The following code fragment illustrates the use of IDirect3DDevice7::DrawPrimitive for drawing the point list in the preceding example. All calls to IDirect3DDevice7::DrawPrimitive must occur between IDirect3DDevice7::BeginScene and IDirect3DDevice7::EndScene.

HRESULT hResult;
// This code fragment assumes that lpDirect3DDevice is a valid 
// pointer to an IDirect3DDevice7 interface.
hResult = 
    lpDirect3DDevice->DrawPrimitive(D3DPT_POINTLIST,
                                     D3DFVF_VERTEX,
                                     lpVerts,
                                     TOTAL_VERTS,
                                     D3DDP_WAIT);

[Visual Basic]

An application written in Visual Basic creates a point list by filling an array of vertices, as in the following code fragment.

' This code fragment assumes that dx is a valid reference
' to a DirectX7 object.
On Local Error Resume Next
Const TOTAL_VERTS As Integer = 6
Dim Verts(TOTAL_VERTS) As D3DVERTEX
 
Verts(0) = dx.CreateD3DVertex(-5, -5, 0, 0, 0, -1, 0, 0)
Verts(1) = dx.CreateD3DVertex(0, 5, 0, 0, 0, -1, 0, 0)
Verts(2) = dx.CreateD3DVertex(5, -5, 0, 0, 0, -1, 0, 0)
Verts(3) = dx.CreateD3DVertex(10, 5, 0, 0, 0, -1, 0, 0)
Verts(4) = dx.CreateD3DVertex(15, -5, 0, 0, 0, -1, 0, 0)
Verts(5) = dx.CreateD3DVertex(20, 5, 0, 0, 0, -1, 0, 0)

Render the point list using the Direct3DDevice7.DrawPrimitive method. The following code fragment illustrates the use of Direct3DDevice7.DrawPrimitive for drawing the point list in the preceding example. All calls to Direct3DDevice7.DrawPrimitive must occur between Direct3DDevice7.BeginScene and Direct3DDevice7.EndScene.

' This code fragment assumes that d3ddev is a valid
' reference to an Direct3DDevice7 object.
Call d3ddev.DrawPrimitive(D3DPT_POINTLIST, _ 
                          D3DFVF_VERTEX, _ 
                          Verts(0), _ 
                          TOTAL_VERTS, _ 
                          D3DDP_WAIT)
 
If Err.Number <> DD_OK Then
    ' Code to handle error goes here.
End If

Your application can apply materials and textures to a point list. The colors in the material or texture only appear at the points drawn, and not anywhere between the points.