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[Solved][SlimDX] "Invalid Call" when trying to render a mesh

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Hi, I'm experiencing some problems trying to render a mesh. The application fails with "Invalid Call" at .drawsubset(0). I can view the mesh in the meshviewer that comes with the DXSDK. I'm using a real simple effect at the moment, however the mesh contains normals and such which the effect does not use, could this be a cause? I have also tried rendering other meshes without success. Also, how do you make custom vertices in SlimDX, used to be something like vertex = new customvertex.PositionTextured(...) but I can not find it now, just wanted to see if I can render anything at all. Thanks for looking. Here's the whole application:

Imports SlimDX
Imports SlimDX.Direct3D9

Public Class Form1

    Private D3DDevice As Device
    Private DefaultEffect As Effect

    Private GameRunning As Boolean = True

    Private TestMesh As Mesh

    Private WorldMatrix As Matrix = Matrix.Identity
    Private ProjMatrix As Matrix = Matrix.PerspectiveFovLH(Math.PI / 4, 1, 10, 1000)
    Private ViewMatrix As Matrix = Matrix.LookAtLH(New Vector3(0, 500, -500), New Vector3(0, 0, 0), New Vector3(0, 1, 0))

    Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        If e.KeyCode = Keys.Escape Then
            GameRunning = False
        End If
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load



        Dim D3DPP As New PresentParameters
        With D3DPP
            .Windowed = True
            .SwapEffect = SwapEffect.Discard
            .AutoDepthStencilFormat = Format.D24X8
            .EnableAutoDepthStencil = True
        End With

        D3DDevice = New Device(0, DeviceType.Hardware, Me.Handle, CreateFlags.HardwareVertexProcessing, D3DPP)
        With D3DDevice
            .SetTransform(TransformState.Projection, ProjMatrix)
            .SetTransform(TransformState.View, ViewMatrix)
            .SetTransform(TransformState.World, WorldMatrix)
            .SetRenderState(RenderState.ZEnable, True)
        End With

        DefaultEffect = Effect.FromFile(D3DDevice, "defaulteffect.fx", Nothing, Nothing,_
 ShaderFlags.Debug, ShaderFlags.None, Nothing, Nothing)
        DefaultEffect.Technique = "simple"
        DefaultEffect.SetValue("worldViewProj", WorldMatrix * ViewMatrix * ProjMatrix)

        TestMesh = Mesh.FromFile(D3DDevice, "spaceship.x", MeshFlags.Managed)

        While GameRunning = True

            D3DDevice.Clear(ClearFlags.Target Or ClearFlags.ZBuffer, Color.Black, 1, 0)



        End While

        If DefaultEffect.Disposed = False Then
        End If
        If TestMesh.Disposed = False Then
        End If
        If D3DDevice.Disposed = False Then
        End If
    End Sub
End Class

And here's the effect, from MDXInfo
float4x4 worldViewProj : WORLDVIEWPROJ; //our world view projection matrix

//application to vertex structure
struct a2v
    float4 position : POSITION0;

//vertex to pixel processing structure
struct v2p
    float4 position : POSITION0;
void vs( in a2v IN, out v2p OUT ) 
    //transforming our position from object space to screen space.
    OUT.position = mul(IN.position, worldViewProj);
technique simple
    pass p0
        vertexshader = compile vs_1_1 vs();

[Edited by - JustMe1984 on August 5, 2007 2:59:31 AM]

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INVALID_CALL isn't an error message, it is simply a return value. Enable the Debug Runtimes (Start -> Programs -> DirectX SDK -> Utilities -> DX Control Panel) to get a detailed error message.

Once you enable the debug runtimes, you should be able to view the debug messages in the Output window of Visual Studio (if you don't use express) by enabling "unmanaged debugging" in the project properties.

If you are using VS Express, you can use DebugView (just google the app name for a free download) to catch the debug output from your application.

The debug output should detail exactly what is going wrong, and tell you what it is you're doing incorrectly.

Hope this helps.

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Also, make sure to enable Unmanaged debugging in your project properties, or you may not see the output that DirectX generates.

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Thanks for helping, thought express showed errors the same way VS did, anyways problem solved now, I had forgotten device.beginscene(). Thanks again

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