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Problem with SlimDX / DX9 / Camera


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#1 qventura   Members   -  Reputation: 107

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Posted 08 February 2012 - 07:57 AM

Hi,
I don't really understand how "cameras" work with D3D9

First, how i set my camera up:

public Camera()
		{
			this.eye = new Vector3(0.0f, 0.0f, 0.0f);
			this.lookAt = new Vector3(0.0f, 0.0f, 1.0f);
			this.up = new Vector3(0.0f, 1.0f, 0.0f);
			viewMatrix = Matrix.LookAtLH(eye, lookAt, up);
			projectionMatrix = Matrix.OrthoLH(1 * zoomLevel, 1 * zoomLevel, 0.0f, 1.0f);
		}

And my vertices :

			vertices = new VertexTexture[]
			{
				new VertexTexture()
				{
					Position =  new Vector4(0.0f, 0.0f, 0.0f, 1.0f),
					TextureCoord = new Vector2(0.0f, 1.0f)
				},
				new VertexTexture()
				{
					Position =  new Vector4(0.0f, model.Height, 0.0f, 1.0f),
					TextureCoord = new Vector2(0.0f, 0.0f)
				},
				new VertexTexture()
				{
					Position =  new Vector4(model.Width, model.Height, 0.0f, 1.0f),
					TextureCoord = new Vector2(1.0f, 0.0f)
				},
				new VertexTexture()
				{
					Position =  new Vector4(model.Width, 0.0f, 0.0f, 1.0f),
					TextureCoord = new Vector2(1.0f, 1.0f)
				}
			};

It works. I can move the camera, zoom, etc.

But the cameras properties seems weird to me ! I thought it would be something like:

public Camera()
		{
			this.eye = new Vector3(0.0f, 0.0f, 1.0f);
			this.lookAt = new Vector3(0.0f, 0.0f, 0.0f);
			this.up = new Vector3(0.0f, 1.0f, 0.0f);
			viewMatrix = Matrix.LookAtLH(eye, lookAt, up);
			projectionMatrix = Matrix.OrthoLH(1 * zoomLevel, 1 * zoomLevel, 0.1f, 100.0f);
		}

but with that parameters it doesn't work. Same if i change the Z coordinate for my plan (Which need to be set at 0 to work).

Now, i try to render other objects. I generate vertices for a sphere (it works fine on D3D 10, a 1 radius sphere generated around (0;0;0) ) but nothing appear on the screen

I played with the eye and lookat parameters but i can figure how to make it work, so, what i m doing wrong ?

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