Cant get Multiple BasicEffects to work

Graphics
1

Been stuck on this challange for a while.
Im trying to change effect or texture on a Quad(2 tiangles) at runtime.
My Quad class containg the VertexPositionNormalTexture information to draw the quad.
This works as intended, and texture/light/ambient are all ok.
The Quad also containg information about what Texture or effect should be used

I’ve tried a couple of different ways to solve this. Is there a perticular order to do this.

Psudo code:
BE1 = BasicEffect // Stone texture
BE2 = BasicEffect // Wood texture
TestEff = BasicEffect // This will be Equal to BE1 or BE2 at runtime

For each Quad
If Quad.Region = 1 then
TestEff = BE1
Else
TestEff = BE2
End IF

Dim VPNT(5) As VertexPositionNormalTexture (Gets information from quad and creates both triangles)

                For Each Eff As EffectPass In TestEff.CurrentTechnique.Passes
                    Eff.Apply()
                    TestEff.World = Camera.World
                    TestEff.View = Camera.View
                    TestEff.Projection = Camera.Projection
                Next
                GraphicsDevice.DrawUserPrimitives(Of VertexPositionNormalTexture)(PrimitiveType.TriangleList, VPNT, 0, 2)

Next

When I try this, its only using the last Effect used, on all faces. Also tried to set TestEff.Texture = another texture, same result.
I guess one or both approches should be possible, but need some other command/code here as well.

The last Project I did in MG had all Components in different class instances, With their own Draw metode. That worked as it was intended.

Some guidence would be very helpful :slight_smile:

Zellpop

2

For a technique with multiple passes, you should do the draw call very time after applying a pass. So for your code the draw call should be inside the for loop. That’s not really important here because BasicEffect techniques are all single-pass.

I don’t see anything else wrong with your code that would cause the error you’re describing. Did you verify that the texture of both effects is set up correctly?

3

Yes both textures and effects works correctly.
When I use one BE and changes the texture, it draws all Quads/triangles with the last texture used.
Same with two BE, it draws all Quads/triangles with the last used BE.

So if no one spots what I have missed, my next option is Shaders?
I was hoping to start that journy later.

Zellpop

4

Hmmm. It Works now
I dont know why :slight_smile:
Only added a couple of Debug.print lines to be sure I tested for the right values

Might have been the VS update last night, that needed a restart, or a hickup in my computer

Anyway, thanks for trying to solve it

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