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[C++][Direct3D] Drawing line in world coordinates

 
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661089799107
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PostPosted: Sat Apr 30, 2011 11:00 pm    Post subject: [C++][Direct3D] Drawing line in world coordinates Reply with quote
I'm trying to draw a 3D line using world coordinates in my EndScene hook.

I had no problems when trying to draw in screen coordinates. However for some reason when trying to draw a line in 3D, it does not seem to be getting rendered.

Code:

HRESULT WINAPI EndScene(IDirect3D9* This) {
   if(render) {
      DWORD  zBuffer;
      DWORD lighting;
      DWORD fvf;
      LPDIRECT3DBASETEXTURE9 texture;
      IDirect3DVertexShader9* vertexShader;

      // Save
      d3dDev->GetFVF(&fvf);
      d3dDev->GetTexture(0, &texture);
      d3dDev->GetVertexShader(&vertexShader);
      d3dDev->GetRenderState(D3DRS_LIGHTING, &lighting);
      d3dDev->GetRenderState(D3DRS_ZENABLE, &zBuffer);

      // Set
      d3dDev->SetFVF(D3DFVF_XYZ | D3DFVF_DIFFUSE);
      d3dDev->SetTexture(0, NULL);
      d3dDev->SetVertexShader(0);
      d3dDev->SetRenderState(D3DRS_LIGHTING, FALSE);
      d3dDev->SetRenderState(D3DRS_ZENABLE, TRUE);

      drawLine(d3dDev, 460.0f, 27.0f, 73.0f, 460.0f, 200.0f, 73.0f, D3DCOLOR_ARGB(255, 255, 0, 0));

      // Restore
      d3dDev->SetFVF(fvf);
      d3dDev->SetTexture(0, texture);
      d3dDev->SetVertexShader(vertexShader);
      d3dDev->SetRenderState(D3DRS_LIGHTING, lighting);
      d3dDev->SetRenderState(D3DRS_ZENABLE, zBuffer);
   }
   return oEndScene(This);
}


Code:

void drawLine(IDirect3DDevice9* device, float x1, float y1, float z1, float x2, float y2, float z2, COLORREF color) {
   D3DTLVERTEX vertex[2];

   vertex[0] = D3DTLVERTEX(x1, y1, z1, 1.0f, color);
   vertex[1] = D3DTLVERTEX(x2, y2, z2, 1.0f, color);

   if(device->DrawPrimitiveUP(D3DPT_LINELIST, 1, &vertex, sizeof(D3DTLVERTEX)) != D3D_OK)
      console("drawLine failed");
}


Last edited by 661089799107 on Mon May 09, 2011 2:08 pm; edited 2 times in total
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hcavolsdsadgadsg
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PostPosted: Sun May 01, 2011 1:46 am    Post subject: Reply with quote
taking shots in the dark


i'd probably disable the depth buffer first, maybe other geometry is occluding it

your vertex definition is suspect. D3DTLVERTEX looks ancient, don't know why you're using it. if you want to draw strictly in 2d, use an orthogonal projection or D3DFVF_XYZRHW (and THEN introduce W)

Code:
D3DFVF_XYZ | D3DFVF_DIFFUSE


should just be a struct like:

Code:
struct AWESOMEVERT
{
       f32 x, y, z;
       u32 color;
};
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661089799107
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PostPosted: Sun May 01, 2011 2:27 am    Post subject: Reply with quote
Quote:
if you want to draw strictly in 2d, use an orthogonal projection or D3DFVF_XYZRHW (and THEN introduce W)


I used D3DFVF_XYZRHW when I was drawing in 2D previously(to test my hook), and it worked fine. I only want to draw in 3D though.

Quote:
your vertex definition is suspect. D3DTLVERTEX looks ancient


This is my D3DTLVERTEX:

Code:

class D3DTLVERTEX {
   public:
     float x;
     float y;
     float z;
     float rhw;
     DWORD color;

     D3DTLVERTEX() {}

     D3DTLVERTEX(float x, float y, float z, float rhw, DWORD color) {
      this->x       = x;
      this->y       = y;
      this->z     = z;
      this->rhw   = rhw;
      this->color = color;
     }
};
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hcavolsdsadgadsg
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PostPosted: Sun May 01, 2011 2:33 am    Post subject: Reply with quote
drop the rhw part of the struct if you aren't using it. make sure you're trying to send a vertex that matches the format you specified. you can also use a D3DXVECTOR3

setting the reciprocal of homogeneous w to 1 effectively does nothing in the perspective divide since you (hopefully) already have your coordinates in screen space, hence why it's useful for 2d.
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661089799107
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PostPosted: Sun May 01, 2011 2:58 am    Post subject: Reply with quote
slovach wrote:
drop the rhw part of the struct if you aren't using it.


After removing the rhw, it still does not work. Sad
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hcavolsdsadgadsg
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PostPosted: Sun May 01, 2011 3:55 am    Post subject: Reply with quote
are you sure you're drawing it somewhere it's actually visible?

check the dx debug runtime info / returns.
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661089799107
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PostPosted: Wed May 11, 2011 6:17 am    Post subject: Reply with quote
slovach wrote:
are you sure you're drawing it somewhere it's actually visible?

check the dx debug runtime info / returns.



It's not being drawn near any other object.

I can use the game's in-game console command to draw a line with the same coordinates.
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hcavolsdsadgadsg
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PostPosted: Wed May 11, 2011 9:37 am    Post subject: Reply with quote
I keep seeing you bump this but I don't know. Disable the depth buffer and culling and try to draw something obnoxious that's impossible to miss. The D3D debug output might have something interesting to say, failing that.
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