The error I'm getting is in:
And it says InvalidOperationException. You may not modify a resource that has been set on a device, or after its been using within a tiling bracket.

The only changes I made was that its no longer a drawable component, now I manually make the calls for initialize, load, update and draw. The other change I made is creating a class with a List of particle systems that takes care of those calls, as far as I can see neither of those should affect this.

Im pretty lsot as to what the error can be, hopefully someone can help me out.

That error message means pretty much what it says. You cannot to something like:

• Set data into buffer
• Draw using buffer
• Set other data into buffer

Instead you must write:

• Set data into buffer
• Draw using buffer
• Unset buffer from the graphics device (by selecting some other buffer, or null)
  
• Set other data into buffer

Perhaps some other code in the sample used to be resetting the VB between one frame and then next, but if you took that code out so you're not drawing anything other than the particles, you could be having the same VB left set from the previous frame? Try resetting it to null at the end of the particle drawing.

Thanks, that worked fine, I actually included another class for terrain and since they both use a vb it kinda fixed itself :P

Now the problem im having is that when the particles start running the rendering of all objects changes and starts showing with like a like blue color over it, im using a different shader for the rendering of the rest of the objects, and the sample apparently resets the changes it makes to the renderstate of the device



Im guessing it can only be one of the other changes to the renderstate that is doing this right?

I added a function called UnSetParticleRenderStates and basically reversed everything to how it used to be before the particle system makes the call and now the light blue is gone... only one problem left, I have another model in the scene and for some reason its texture gets streched after I call the particle generation... Im lost on this, any hints? :)

I tried commenting the code that caused this and then discomment line by line and testing and I managed to narrow down the problem, it heppens when the code cycles through the EffectPasses to draw the particles, so im assuming the problem is in the shader.

Hi,

I have the same issue.  Did you ever work out what the problem was?

cheers

I worked it out.  The sharder code was setting the following to TextureAddressMode.Clamp.  If you reset to Wrap after the Draw() it fixes things (see below).

  device.SamplerStates[0].AddressU = TextureAddressMode.Wrap;
  device.SamplerStates[0].AddressV = TextureAddressMode.Wrap;