Texture mapping over an array of vertices?

Graphics and GPU Programming Programming

Started by exextatic September 14, 2011 07:04 AM

12 comments, last by exextatic 12 years, 7 months ago

exextatic

111

Author

September 14, 2011 07:04 AM

Hi all, first post here

Slight problem trying to map a texture over an array of vertices. My vertices shape a terrain but I cant get the texture to map over them.
My code:

LPDIRECT3DVERTEXBUFFER9 p_dx_VertexBuffer;

OURCUSTOMVERTEX cv_Vertices[WIDTH * HEIGHT];

float flt_HeightData[WIDTH][HEIGHT];



for(int i = 0; i < WIDTH; i++)

{

 	for(int j = 0; j < HEIGHT; j++)

 	{

          flt_HeightData[j] = noise->smoothNoise(i, j);

 	}

}





float temp1 = 0, temp2 = 0;

for (int x = 0; x < WIDTH; x++)    

{

    for (int y = 0; y < HEIGHT; y++)        

    {

 		cv_Vertices[y * WIDTH + x].x = -x;

 		cv_Vertices[y * WIDTH + x].z = y;

 		cv_Vertices[y * WIDTH + x].y = flt_HeightData[x][y];

 		cv_Vertices[y * WIDTH + x].color = 0xffffffff;

 		cv_Vertices[y * WIDTH + x].U = temp1;

 		cv_Vertices[y * WIDTH + x].V = temp2;

 		temp2 += (1.0f/WIDTH);

    }

 	temp1 += (1.0f/HEIGHT);

}



if (FAILED(d3ddev->CreateVertexBuffer(WIDTH * HEIGHT * sizeof(OURCUSTOMVERTEX), 0, D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1, D3DPOOL_DEFAULT, &p_dx_VertexBuffer, NULL)))

{

 	MessageBox(hWnd, "Error while creating VertexBuffer", "FillVertices()", MB_OK);

}





VOID* p_Vertices;

if (FAILED(p_dx_VertexBuffer->Lock(0, WIDTH * HEIGHT * sizeof(OURCUSTOMVERTEX), (void**)&p_Vertices, 0)))

{

    MessageBox(hWnd,"Error trying to lock", "FillVertices()", MB_OK);

}

else

{

    memcpy(p_Vertices, cv_Vertices, WIDTH*HEIGHT*sizeof(OURCUSTOMVERTEX));

    p_dx_VertexBuffer->Unlock();

}

That code is from the function that initialises my terrain. noise is my Perlin Noise class.

struct OURCUSTOMVERTEX

{

    float x,y,z;

    DWORD color;

	FLOAT U, V;

};

Is the vertex struct.

Any ideas?
Thanks

James Warner

B_old

689

September 14, 2011 07:52 AM

One thing that looks suspicious is this:





int temp1 = 0, temp2 = 0;



for (int x = 0; x < WIDTH; x++)    

{

	for (int y = 0; y < HEIGHT; y++)        

	{

		//...

		temp2 += (1/WIDTH);

	}

	temp1 += (1/HEIGHT);

}

You are probably not storing the values in temp that you expect. Try using float variables for that and (1.f/WIDTH).

exextatic

111

Author

September 14, 2011 07:58 AM

One thing that looks suspicious is this:
int temp1 = 0, temp2 = 0; for (int x = 0; x < WIDTH; x++) { for (int y = 0; y < HEIGHT; y++) { //... temp2 += (1/WIDTH); } temp1 += (1/HEIGHT); }

You are probably not storing the values in temp that you expect. Try using float variables for that and (1.f/WIDTH).

Using your code I got:

This is what I got before
By the way, the texture Im using is:

Sesha

107

September 14, 2011 08:02 AM

Hi OCN.FiX.

If the texture is not loading, be sure the texture file is within the folder or specified place, another thing is to change FVF declaration in the line if (FAILED(d3ddev->CreateVertexBuffer(WIDTH * HEIGHT * sizeof(OURCUSTOMVERTEX), 0, D3DFVF_XYZ|D3DFVF_DIFFUSE, D3DPOOL_DEFAULT, &p_dx_VertexBuffer, NULL))) from
D3DFVF_XYZ|D3DFVF_DIFFUSE to D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1

exextatic

111

Author

September 14, 2011 08:09 AM

Hi OCN.FiX.

If the texture is not loading, be sure the texture file is within the folder or specified place, another thing is to change FVF declaration in the line if (FAILED(d3ddev->CreateVertexBuffer(WIDTH * HEIGHT * sizeof(OURCUSTOMVERTEX), 0, D3DFVF_XYZ|D3DFVF_DIFFUSE, D3DPOOL_DEFAULT, &p_dx_VertexBuffer, NULL))) from
D3DFVF_XYZ|D3DFVF_DIFFUSE to D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1

Yes, Im sure the texture is loading. I changed what you said but it didnt do anything.
Here is the code in my render function if it helps:

// Render my terrain:

d3ddev->SetStreamSource(0, tVertexBuffer, 0, sizeof(OURCUSTOMVERTEX));

d3ddev->SetFVF(D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1);

d3ddev->SetIndices(tIndexBuffer);

d3ddev->SetTexture(0, texture);

d3ddev->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, WIDTH * HEIGHT, 0, (WIDTH - 1) * (HEIGHT - 1) * 2);