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isometric perspective

Started by Hauptman May 4, 2004 at 12:14 PM 1 replies 350+ views

Original Post

May 4, 2004 at 12:14 PM

Hi! I want to make a isometric perspective in a 3D world. So I thought about transforming my world matrix. ok. I read some articles on isometric perspective here von gd.net, but these things weren''t able to help me. So, I just want to make a world transformation to have an isometric perspective. Can somebody explain me the principle of such a transform or could somebody help me with some code

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circlesoft

101

circlesoft

May 4, 2004 at 4:44 PM

I would check around and do some searching in the Isometric forum. I''m sure they have something about perspective matrices in there somewhere.

Dustin Franklin
Mircrosoft DirectX MVP

Supernat02

May 4, 2004 at 11:16 PM

I like this website's explanation.

http://www.angelcode.com/dev/worldview/worldview.asp

I think it's the view projection that you'll want to look at, i.e. where the camera is in the world. A simple example of code to place the camera at a point, looking at another point is:


UpDirection = D3DXVECTOR3(0.0f, 1.0f, 0.0f);

    EyePoint.x = LookAtPoint.x + sinf(YRotation)*ZDistance*ZoomPercentage;
    EyePoint.y = PlaneDistance*ZoomPercentage;
    EyePoint.z = LookAtPoint.z + cosf(YRotation)*ZDistance*ZoomPercentage;

    CloseUpPoint.x = LookAtPoint.x + sinf(YRotation-0.03f)*ZDistance*0.90f*FZoomPercentage;
    CloseUpPoint.y = (FPlaneDistance*0.90f*ZoomPercentage);
    CloseUpPoint.z = LookAtPoint.z + cosf(YRotation-0.03f)*ZDistance*0.90f*ZoomPercentage;

    // Create the Matrix

    D3DXMatrixLookAtLH(&ViewMatrix, &EyePoint, &LookAtPoint, &UpDirection);

You would then set your transform as such:
D3DDevice->SetTransform(D3DTS_VIEW, ViewMatrix);

This code comes from my engine. Changing the various parameters allows freedom to rotate the camera around the LookAtPoint, at a certain height and distance from that point.

Chris

[edited by - Supernat02 on May 4, 2004 12:22:40 AM]

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