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as you might have read in the VL: ThreeDee blog post, we see two major workflows with vl/xenko. To get familiar with xenko we jumped on a project where the second mentioned workflow, "Xenko game as a host for VL" makes sense.
First contact was better than expected and we were quickly able to patch with the original xenko entities. The nodes we created so far allow to setup the scene graph and also combine it with scenes or prefabs made in xenko's game studio.
We also tested custom 3d drawing á la vvvv dx11 and the performance is crazy good so far! We implemented some pretty complex shader pipelines like a 3d fluid simulation and particle systems and we see insane frame rates, even on laptops.
The scene graph is a high level system that has concepts like light, shadow, materials, physics, audio etc. Patching with the scene graph feels quite easy since there is no need to work with shaders directly. Let's see how this looks like:
The entry point into the rendering is the RootScene:
Much like a vvvv Renderer you connect the content to its input. Each object in the scene is a so called Entity. Or in other words, entities are the building blocks of the scene graph. They can be as simple as a Quad or as complex as a complete level of a game. For example the Box or the AxisAndGrid node are entities. Entities can also have children, so we modeled the almighty Group node as an entity with two or more inputs for child entities:
For a basic setup we can connect an AxisAndGrid and a DirectionalLight to the Group:
It might feel odd to vvvveterans to connect AxisAndGrid and DirectionalLight to the same Group. But this is what the engine manages for you, it picks up all entities in the scene graph and builds the correct shaders, render calls, physics setup and so on from it. That is how most modern game engines work, the concept is called entity/component/system (short ECS) and xenko has a nice documentation about it here if you want to know more.
Of course you can still work with custom shaders when needed. More on that in an upcoming blog post.
Now let's finish our little scene by adding a floor plane and a box:
There you have it, doesn't it look nice?
If you want to see more vl/xenko in action, join us at the next vvvv meetup where we will give a bit more insight into the current state of the library: vvvv meetup #5
See you there,
Found another one everyone should know about. The open source GPU debugger RenderDoc works just fine with vvvv and dx11. This can help to profile and debug shaders and your graphics performance and find bottlenecks. I might even prefer this one over the Nvidia one found in the last post. Its open source, the controls feel a bit more intuitive and it should also work with ATI cards:
The steps are pretty simple:
RenderDoc was originally developed by Crytek for the Cryengine and was open sourced in 2014: https://www.cryengine.com/renderdoc
That's it, now you know more.
Just a quick one found today and everyone should know about. Nvidia Nsight Graphics works just fine with vvvv and dx11. This can help to profile your graphics performance and find bottlenecks.
The steps are pretty simple:
That's it, just so you know.
beta37 is done - as far as we know. Now, please help us to find out!
Try the release candidate - link at the bottom - by opening the project you're currently working on and see if it opens timely, patching is responsive and everything works correctly. If not, please let us know in the forum using the alpha tag.
This one can be understood as a late spring cleaning.
To get the desired appearance in the node browser we at times needed to resort, rename and polish nodes and types without changing much in terms of functionality. There were other examples though where we refined some major bits in the basic node set - e.g. file IO and serialization nodes got a complete rework and just got so much easier to use. And we made sure that the core library feels more explorable just by making basic nodes more visible than others. Advanced, experimental or obsolete nodes now don't hide in different packages but can be opted into the list of nodes, while browsing the library. Within that process, we also polished the node browser quite a bit.
But this release also comes with features for you to clean up. Frames help to structure patches in a visual way, groups, and categories in a structural way. You even can tweak the visibility of your nodes in the node browser and by that distinguish rather advanced or still experimental nodes from the daily node set. Library developers will also love the feature to make certain helper nodes internal so that they are free to change or delete them at any time in the future.
Startup speed got improved. Also, there are less VL documents open making the navigation menu more meaningful. Let me not begin with the much lighter ".Net Packages" menu or the much lighter download size. Process nodes now opt for mutation which makes them lighter in terms of memory allocation.
Together these features allow this workflow:
In essence, this allows to do example patches, tutorials or help patches - an essential feature that will make future libraries so much easier to learn. To have a patch start on document load, create a non-generic process called "Root" in the document patch. So again from the end user perspective: no need to create a node in vvvv to see the patch running.
Ctrl-W now behaves like in an internet browser: It just closes the tab - closing the last tab closes the VL window. Ctrl-W doesn't ask you to save the document though. Closing a tab doesn't close the document, it just closes the view onto the specific patch within the document.
If you now managed to hide the VL window use the "Show VL" command in the vvvv main menu to get back into VL.
Debugging should feel much more intuitive, as it now allows to inspect the exact state of the patches for the moment when something went wrong.
Some notes on the debugging settings:
You can switch the settings via Quad menu -> Settings -> Open in editor.
Actually we never really told you about how amazing the Cache region is. If you have any node that you want to perform better, ask yourself if it wouldn't be enough to only compute it when the input changes and then cache the computed results. The cache region allows expressing this easily. The cache region actually got added with beta36, but now the interplay with other constructs works better.
Loops for example now output their spreads in a way that the changed-detection of a downstream connected Changed node or Cache region only triggers if the slices actually changed from frame to frame.
Some of this stuff may for sure sound pretty special interest, but we have the feeling that these details matter in the end for having an expressive but playful language.
All in all this release makes VL easier to learn, use and develop for.
for an in-depth list of changes have a look at the changelog.
Release Candidate 6
Beware: Make sure you secure your data. Patches saved with an alpha might lead to not being able to open them with the former beta.
Not many will remember the times when vvvv's 3d rendering was based on Direct3D 8. Not important really, because at the same time we released vvvv 33beta1 in December 2002, Microsoft released Direct3D 9 with a lot of new features, so we knew what we had to do..
Luckily vvvv's DX9 implementation proved powerful enough to be quite useful for many years. Then it took Microsoft 5 years to release its successor DX10 which was only available on Windows Vista, which nobody wanted. Also graphic-card adoption took quite a while so we didn't really feel an urge to start working on it right away.
A year later in 2008 Microsoft released Windows 7 and with it DX11, which altogether looked more promising. But still a lack of adoption of supported hardware and Windows 7 didn't put too much pressure on us to implement it. Instead we thought it would be smarter to improve the plugin-interface for vvvv to make it easier for users to contribute to the library of nodes.
In parallel we had already secretly started work on our next big thing that would become VL, which we first announced at the keynode during NODE13. Since with VL we've mentioned from the beginning that we wanted it to eventually run across platforms, for us, implementing a new renderer based on the windows-only Direct3D api became less and less appealing.
What happened next couldn't have been more fortunate: besides many other major contributions, using the possibilities of vvvv's plugin-interface, power-user vux took it in his own hands to create a set of nodes for rendering with the features of DX11, which he released on vvvv's 10th birthday in December 2012. And the vvvvorld was a better place.
DX11 for vvvv is amazing, but innovation in the world of computer graphics started moving faster and faster. Despite the magic that DX11 brought, users demanded more and more bling, but all we were talking about was how VL would revolutionize visual-programming, which brought us all together in the first place.
With the cross-platform goal in mind, for years it seemed the only option was going for OpenGL instead of Direct3D as rendering API for VL. But all those years, following OpenGLs development and stories about bad support by Microsoft and Apple never got us excited enough to just go for it. Meanwhile a new player has appeared as a modern cross-platform graphics API, called Vulkan, but since it is still in its early stages and support for MacOS seems not official yet, again we were reluctant to jump on it.
All the years we knew there would be another option: Instead of using Direct3D, OpenGL or Vulkan directly, we could base a rendering library for VL on a game-engine API that would deal with different graphics APIs under the hood and would possibly have all 3 as back-ends that can be used on different platforms without us needing to worry about it.
While this sounds brilliant, it obviously has other potential drawbacks (out of scope for this post). But also the range of options for game-engines we could have used wasn't too overwhelming. Until recently. Enter Xenko.
We've had an eye on this engine for a while already but it being targeted at commercial game-studios would mean that every user of vl would also need to buy a license for it, so again we were hesitating and looked for alternatives.
But what just happened could again not have been more fortunate: The company behind Xenko, Silicon Studio, removed its commercial licensing and released it to the community under the MIT license, which is a very permissive open source license. This would allow us to base a renderer for VL on it without any licensing restrictions.
Initial tests look very promising. Within just a few days we were able to patch a little interactive scene and export the project as an executable so it could be distributed via the Steam store and run on a VR device.
Hence our plan is to investigate further in this direction and at the moment we see two interesting workflows between VL and Xenko:
For both scenarios what will be important, is a proper library design wrapping the original Xenko functionality into a comfortable set of nodes, similar to what we just did for Skia.
We'd usually not water your mouths before we are more sure about things. But with Xenko just having gone full open-source and looking to build a community of developers and users, we thought it would be a good idea to talk about this now and try to involve you from the beginning.
So if you're curious about Xenko's universe, just head over to its website and see what it has to offer. You can even download and play around with the editor and if you're familiar with C# create a little game with fancy graphics and assets in no time.
Next we'll demo what we've got so far to participants at LINK and start a discussion there. If you're not at LINK please still join the discussion with your thoughts using this thread. If all goes well we should also be able to share our proof of concept sometime after LINK.
So we hope you understand that at this stage it is too early to promise anything but at the moment we are confident to having found the right library for implementing a 3d rendering system for VL. Just as we were happy when we finally found Skia as the perfect library for VLs 2d rendering system.
We'll update you about developments as we progress...
Skia is a modern and fast 2d rendering library. As usual, we stand upon the shoulders of giants when making this functionality available to you: the core Skia technology and the .Net binding "SkiaSharp". The VL.Skia package aims to make all of this functionality available within VL in an easy-to-use high-level node set.
You now can have the first glimpse on it. From the start, it comes with a nice stack of tutorials and example patches. This package is done for vvvvbeta37.
Here is a rough overview of what the key concepts are:
Just like known from vvvv the main idea is that layers can be grouped and can be connected to a renderer to draw them. Most Layers come with a Bounds input OR Position and Size and Anchor.
We offer different renderers:
Every layer comes with a Paint input. It describes how to draw the layer. This is very comparable to the render states in DX9/DX11.
You can stack the Paint-modifying nodes. Nodes like SetColor would take everything from the incoming paint and only adjust the color.
Shaders, Filters, and PathEffects are all properties of Paint. 1000 words wouldn't be enough to describe what you can do with them. You probably just need to play with them a bit.
Text nodes are also just Layers. You can think of them as text boxes.
Within that rectangular region you now can adjust horizontal and vertical alignment. This is done via properties of Paint. The FontAndParagraph node allows to conveniently adjust several text related paint properties in one go.
You can visualize the text box with the Show Helpers pin of FontAndParagraph.
(See the examples\3_Text for how to do word wrapping etc.)
Layers can be transformed. This allows you to patch a Camera. You would then connect your scene to the Camera and the camera to the renderer.
Transforms are not that important as in 3D rendering frameworks as all Layers already can be placed.
Scaling a Layer influences the stroke width. If this is unwanted specify the Size on the layer itself and not via transform node.
We designed the library in a way that it works for different scenarios. Sometimes you would like to think in a normalized space, like known from DX9/DX11. In other scenarios, you want to think pixel- or device-independent-pixel-based.
Layers in Skia can be interactive. The main idea here is: "What you see is what you want to interact with". So if the layer is interactive, connecting it to the renderer in one way or the other means that it will be drawn AND that you can interact with it. (See examples\5_Interaction)
This part is under construction still.
In order to use this library with VL, you have to install the NuGet that is available via nuget.org. For information on how to use NuGets with VL, see Managing NuGets in the VL documentation. In short, navigate via document menu to Dependencies -> Manage NuGets -> Commandline and then type:
As long as we don't have an example browser here is how to get them via windows explorer:
Drag & drop an example patch onto vvvv or VL. For closing the example use the X on the renderer or hit Ctrl-F4 on the VL patch.
Serialization in VL has drastically been simplified by introducing two new nodes called Serialize and Deserialize in the category System.Serialization.
Let's first have a look at two basic examples:
As you can see from the screenshot the resulting string is very short and contains only the mimimum amount of data. It achieves that tidyness by only serializing user defined properties, skipping properties which have the default value, making use of XML attributes, putting collections of primitive values into comma separated strings and adding type information only when necessary.
When deserializing the system will try to apply the serialized content on the instance to be created. This makes it very resilient to future patch changes as adding or removing properties and to some extend even changing the type of a property will just work.
Serializers are provided for all primtive types (Boolean, Integer32, Float32, etc.), collection types (Array, Spread, Dictionary, etc.), commonly used imported types (Vector2/3/4, Matrix, Color, etc.) and most importantly all patched types. If a serializer should be missing for a certain type either report it to us or keep on reading to the next section where you learn how to patch (or write) your own serializer.
Paired with the new files nodes serialization to disk is straight forward:
That's basically all there is to know from an end-user perspective. You can try these new nodes in the latest alpha versions.
Even though VL ships with serializers for the most common types the situation could still arise where a custom serializer has to be written - either because it's simply missing for the type in question or one is not satisfied with the output of the already existing serializer.
Creating a custom serializer consists of two steps
Here are two screenshots of the above from an example implementation which can be found in the VL.CoreLib/help/Serialization.vl file:
We're looking forward to your feedback.
as an avid vl user by now you've understood that in vl there are different kinds of patches. While colloquially we just call them all patches for simplicity and because they all allow you to patch in them, we can easily distinguish two main types of patches:
While datatype patches more resemble what we had in vvvv, structural patches are new in vl. We just reworked this part a litte and ended up with 3 structural patches which make things much more clear:
But before we go on let's make sure we are on par regarding the term "Category":
Obviously. (Yeah, just wanted to make sure)
What we had so far was a not so clear mix of all three. Let's see what we have in latest alpha:
Group patches simply allow you to create more space in a patch by opening a new canvas. The groups name is merely used for human readability, vl doesn't care about it at all. Create a group by typing "group" in the nodebrowser. Groups is what you will be mostly using in your daily project-patching work.
Inside a group patch
Group patch from the outside
A Category patch looks quite similar to the group, only its name has a meaning: The name appends itself to the category of its parent patch. That way you can build up any category hierarchy, that you then see in the NodeBrowser. Multiple category levels are allowed with dot notation. e.g. MyCat1.MyCat2.
Inside a category patch
Category patch from the outside
A Full Category patch is similar to the Category patch, only that it doesn't add its category to the parent. By that you can place nodes in any category, regardless of the parent patch. It's considered bad practice to do that, but is useful to add nodes to an existing category like Collections.Spread, for example. Multiple category levels are allowed with dot notation. e.g. MyParentCat.MySubCat.
Inside a full category patch
Full category patch from the outside
Each vl document can directly start a category, which you can define in the angular brackets in the top left corner of the document patch.
You can easily convert a group patch into a category patch and vice versa by the patch type enum. Note how the label changes and represents the actual category structure:
As if the above didn't offer enough options already there is one more way to specify a category for an operation or a datatype definition:
Happy node sorting!
Some things take a while longer...
Planned since vvvv pre-beta1 we're happy to finally bring you:
Patches tend to do different things all at once and when looking at them it is often not clear at first sight which part of a patch does what. We have comments to add a few words at certain spots but those fail when we'd like to point at a group of nodes that do a certain thing. So the idea is to have a visual element we can place in a patch to frame a group of nodes and mark them with a color and label. This will help us to better structure and document large patches.
Frames are always in the very back of everything. They don't contain any other elements and they cannot be contained in other regions. They are mere visual elements and don't interfere with the functionality of a patch in any way.
To show/hide all frames in a patch at once, press CTRL+ALT+F.
To frame a bunch of selected nodes, press ALT+F.
Besides being structural elements, frames also allow you to take screenshots easily and repeatably. We're using this e.g. to automate generating screenshots for our documentation...
Here is how:
To create a quick screenshot of an area without even creating a frame, simply press S while making a selection. This will copy the screenshot to the clipboard (so you can simply paste it into the chat or a forum reply) and also place a .png next to the current .vl document.
Apart from single screenshots you can also record an animated gif of the area of a frame, here is how:
Note that the resulting .gifs are quite large. This is a known problem that shall be fixed at some point.
One more: In case you want to make a recording that includes panning or zooming in the patch you can create a frame in screenspace:
Here is to inform you about an update to general File input/output in VL available for testing in latest alphas today. Introduced 1.5years ago we've now completely reworked this from the ground up with the things we've learned so far.
We noticed that even though obviously you'll often want file io to be non-blocking, there are cases where blocking makes sense. So we now give you the following:
These are the most simple to use, very close to the comparable vvvv versions, only without error reporting, which we explain below.
In the case we want to have our file io non-blocking we learned that most likely we don't only want to load the file but often also do some kind of "transformation" to the data before it is used further in the patch. Most likely this transformation should also be non-blocking and we only want to be informed when that part is done as well. Introducing:
Instead of returning the actual data of a file, those readers return an Observable<Data> which allows you to do some further processing to the data before you get access to it in the patch using a HoldLatest node. For more information on working with observables see the chapter Reactive.
The writers in turn also take an Observable<Data> and write whenever new data is pushed through the observable. Like this you can e.g. write data received from an input via an observable directly to a file without ever touching the mainloop:
While in vvvv we had different names for file accessing nodes, like: Reader (Raw), FileTexture (EX9.Texture), XFile (EX9.Geometry Load), MP3Parser (File), ... we decided on a new naming scheme for VL:
Like this, typing "reader" or "writer" in the nodebrowser, you'll be guaranteed to find all available readers and writers.
Reading or writing files can go wrong for different reasons and the system needs a way to inform you about this. Previously, error handling of reader/writer nodes was inconsistent. Some ignored errors, others reported "Success" or returned an "Error Message". Having realized error-handling has to be supported on a higher-level than individually on every node, we have now removed all error handling from those nodes.
Now what? Right, so the first thing you need to know: If an error occurs at runtime it will be catched by vl and the node will go pink, informing you of the problem. Often this is enough.
In case you want to react to an error in your patch we again have to differentiate between the blocking and non-blocking case:
The solution for the blocking case involves using the experimental Try [Control] region and looks like this:
In a non-blocking scenario you can use the HoldLatestError [Reactive] node like this:
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