Adding spacial mapping to DirectX project in C#

ShayneKiekebosch · October 2016

Hey there, I am trying to implement spacial mapping in my DirectX holographic C# project but the only example Microsoft have is in C++. From some searching I can't seem to find any examples in C# and I have never touched C++ so it's going to take me quite a while to get through the explanation and essentially convert it to C#. Has anyone already done this and could provide me with some examples and source code? Or directions on where to start?

Any help is immensely appreciated.

Thanks, Shayne

Dwight_Goins_EE_MVP · October 2016

Hi @ShayneKiekebosch ,

The SubResource Data structure is just a buffer describing some buffer array of data you want to pass into the DX Pipeline buffers you have in your shaders. In the case of the C++ UWP Spatial Mapping example it's the texture coordinates. In your C# SharpDX example it just needs to be a DataBox containing those texture coordinates. Pass in the DataBox into the SharpDX.Direct3D11.Buffer.Create() (Upgrade to SharpDX 3.1 in NuGet). Actually I haven't tried the update on HoloLens yet. You can also just pass in the DataBox into the create method as one of the parameters (w/o update).

Again this example shows you how to use the DataBox.

I'll see if I can get an example up this weekend.

Dwight_Goins_EE_MVP · October 2016

Hi @ShayneKiekebosch ,

Have you looked at this C# sample. It should help you get started. It's not spatial mapping but it shows how you get a texture and apply it to a cube model. It should show how to use SharpDX so you can convert the calls properly using the Spatial Mapping example.

ShayneKiekebosch · October 2016

Thanks for the reply @Dwight_Goins_EE_MVP,

This doesn't really answer my question though. I already have a DirectX holographic project that applies textures etc. I have started converting some of the C++ code but I am now stuck on finding the
D3D11_SUBRESOURCE_DATA bufferBytes = { GetDataFromIBuffer(buffer), 0, 0 };
in the CreateDirectXBuffer method. I can't seem to find the correct one in SharpDX.Direct3D11.

I have found others like the
CD3D11_BUFFER_DESC bufferDescription(buffer->Length, binding);
which was
SharpDX.Direct3D11.BufferDescription = new BufferDescription((int)buffer.Length, binding, ResourceUsage.Default);
in C#.

Dwight_Goins_EE_MVP · October 2016

Hi @ShayneKiekebosch ,

The SubResource Data structure is just a buffer describing some buffer array of data you want to pass into the DX Pipeline buffers you have in your shaders. In the case of the C++ UWP Spatial Mapping example it's the texture coordinates. In your C# SharpDX example it just needs to be a DataBox containing those texture coordinates. Pass in the DataBox into the SharpDX.Direct3D11.Buffer.Create() (Upgrade to SharpDX 3.1 in NuGet). Actually I haven't tried the update on HoloLens yet. You can also just pass in the DataBox into the create method as one of the parameters (w/o update).

Again this example shows you how to use the DataBox.

I'll see if I can get an example up this weekend.

Adding spacial mapping to DirectX project in C#

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