D3D正交投影与透视投影放大mesh的方法

最新推荐文章于 2025-07-13 16:54:23 发布

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最新推荐文章于 2025-07-13 16:54:23 发布 · 744 阅读

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#Directx #3D

本文介绍了如何在Directx的3D环境中，通过鼠标滚轮事件实现正交投影和透视投影下mesh的放大操作。通过调整viewWidth和viewHeight实现正交投影的缩放，并使用Matrix.OrthoLH更新投影矩阵。对于透视投影，通过改变相机位置实现放大效果，但代码未在本次事件中执行。

Private viewWidth As Single = 2
Private viewHeight As Single = 2
Private Sub View3D_MouseWheel(sender As Object, e As MouseEventArgs) Handles Me.MouseWheel
Dim s As Single = -CSng(e.Delta) / 2000
viewWidth += s
viewHeight += s
If viewWidth <= 0 Or viewHeight <= 0 Then
Exit Sub
End If
device.Transform.Projection = Matrix.OrthoLH(viewWidth, viewHeight, 0, 100)

''下面适用于透视投影
'Dim scaleFactor As Single = -CSng(e.Delta) / 2000 + 1.0F
'CamPostion.Subtract(CamTarget)
'CamPostion.Scale(scaleFactor)
'CamPostion.Add(CamTarget)
'Dim viewMatrix As Matrix = Matrix.LookAtLH(CamPostion, CamTarget, New Vector3(0, 1, 0))
'device.Transform.View = viewMatrix
End Sub