How can I create/draw/render grid(plane) using directX? - grid

Question

I want to draw plane that picture.
now I try vertex buffer and DrawPrimitive is D3DPT_LINESTRIP. but not effect I want.
so any way more than effective that???
please give me some advice. thank you.

Answer 1

This could be an option, is not the optimal but would achive that grid
void DrawGrid (float32 Size, CColor Color, int32 GridX, int32 GridZ)
{
// Check if the size of the grid is null
if( Size <= 0 )
return;
// Calculate the data
DWORD grid_color_aux = Color.GetUint32Argb();
float32 GridXStep = Size / GridX;
float32 GridZStep = Size / GridZ;
float32 halfSize = Size * 0.5f;
// Set the attributes to the paint device
m_pD3DDevice->SetTexture(0,NULL);
m_pD3DDevice->SetFVF(CUSTOMVERTEX::getFlags());
// Draw the lines of the X axis
for( float32 i = -halfSize; i <= halfSize ; i+= GridXStep )
{
CUSTOMVERTEX v[] =
{ {i, 0.0f, -halfSize, grid_color_aux}, {i, 0.0f, halfSize, grid_color_aux} };
m_pD3DDevice->DrawPrimitiveUP( D3DPT_LINELIST,1, v,sizeof(CUSTOMVERTEX));
}
// Draw the lines of the Z axis
for( float32 i = -halfSize; i <= halfSize ; i+= GridZStep )
{
CUSTOMVERTEX v[] =
{ {-halfSize, 0.0f, i, grid_color_aux}, {halfSize, 0.0f, i, grid_color_aux} };
m_pD3DDevice->DrawPrimitiveUP( D3DPT_LINELIST,1, v,sizeof(CUSTOMVERTEX));
}
}
The CUSTOMVERTEX struct:
struct CUSTOMVERTEX
{
float32 x, y, z;
DWORD color;
static unsigned int getFlags()
{
return D3DFVF_CUSTOMVERTEX;
}
};
Note: Is only a grid with lines, so you need to draw a solid plane, in order to get a look like result as you want.

Answer 2

You can use DrawPrimitive with D3DPT_TRIANGLESTRIP for a plane. Then draw the indexed lines after with D3DPT_LINELIST with a depth bias. This way, even if they lie on the plane, you won't get any z-fighting.

Answer 3

I will introduce you a book Introduction to 3D programming with DirectX,it has a great
detail on how to do this in Chapter 8,Section 4.