Mapping vertex buffer fails after using SetMorphWeight

[henningpohl]

I'm trying to use blend shapes, but it's not working for me. The model doesn't update.

I stepped through the code and when I change the weights with SetMorphWeight that sets morphsDirty_ and subsequently in UpdateGeometry the UpdateMorphs method is called. So far so good. When I continue through that it also seems to work. However an error then occurs inside the call to buffer->Unlock(). More specifically, that defers to SetDataRange(), where a MapBuffer() call then fails.

I'm using Direct3d11 and the corresponding implementation is:
HRESULT hr = graphics_->GetImpl()->GetDeviceContext()->Map((ID3D11Buffer*)object_.ptr_, 0, discard ? D3D11_MAP_WRITE_DISCARD : D3D11_MAP_WRITE, 0, &mappedData);
This results in an HRESULT 0x80070057 error -> E_INVALIDARG. I am not sure what is at fault here. The ID3D11Buffer pointer seems to be ok. At least it's not null.

[ghost]

@henningpohl How did you create the model that contains the shape keys/morphs; did you use AssImp, the Blender exporter or maybe even something else?
...and could you try another route of you havn't already?

[henningpohl]

I used the Blender exporter. The model does renders fine before I call SetMorphWeight, so at least the base mesh is not broken in any way. I also checked the mtl file (per https://urho3d.github.io/documentation/HEAD/_file_formats.html) and everything seems to be in place.

[ghost]

Have you tried reproducing the issue under OpenGL?

[henningpohl]

No, I have not. I first encountered this issue not with Urho3d, but with UrhoSharp and the C++ version already is an attempt to replicate this behavior. But I'll try to check tomorrow whether I can get it working with OpenGL.

[ghost]

I'm assuming you are building the latest master, and not using the precompiled library.
Can you affirm this assumption?

[henningpohl]

Yes, I compiled Urho3D myself (with Visual Studio 2017)

[henningpohl]

Just checked and yes, when compiled for OpenGL it works.

[henningpohl]

Any idea what to look for to make it work in Direct3D? For the project I'm working on OpenGL is not an option.

[henningpohl]

I also just tried with Direct3D9 and there it also fails, but in a different way. After calling SetMorphWeight, the model disappears and I get continuous "Failed to create vertex declaration" (0x80004005) errors.

[ghost]

Any idea what to look for to make it work in Direct3D?

I do not - for me D3D is not an option - but I'm sure the information you provided will be helpful to anyone that can help you further and may look into this.

[SuperWangKai]

I wonder if it is because the VB is created without "dynamic"

Make sure the VB's dynamic_ is true.

/// Dynamic flag.
bool dynamic_{};

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