» AddonPack.Effects
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Here is how you prepare effects for the addonpack:

Provide a Shader Info

To provide the nodelist with information about a shader that others find it easier, you should use the following keywords at the beginning of the shader code:

//@author: yourname
//@help: this shader does very nice things
//@tags: tag1, tag2, tag3 ...
//@credits: the other guys name

Creating Pins

Writing a variable in the toplevel of the shader creates an input pin for you. For simple pin names you do not have to do anything special, just start with a capital letter:

float Alpha;

Creates a pin named 'Alpha' with default value 0.

float Alpha = 1;

This will create a pin named 'Alpha' with default value 1.
In case you have a more complex name for your pin write it like this:

float Alpha <string uiname="Alpha of Gradient Center";> = 1;

This will create a pin named 'Alpha of Gradient Center' with default value 1.
You can also tell the vvvv GUI to constrain the value:

float Alpha <float uimin=0.0; float uimax=1.0; string uiname="Alpha of Gradient Center";> = 1;

Creating Color Pins

Especially when porting shader-code from public libraries you will often notice that a code like

float4 cAmb <String uiname="Color";>  = {1, 1, 1, 1};

creates only a float input with 4 slices.
Just insert the Semantic


to get a 'real' ColorInput.

float4 cAmb : COLOR <String uiname="Color";>  = {1, 1, 1, 1};

Texture Transformations

If you want to transform a texture on a regular shape you would intuitively expect the center of rotation and scaling in the middle of the texture. But the default center of transform is the texture coordinate (0, 0), which is the upper left corner of your texture.
To counteract this, we provide the convenience sematic 'TEXTUREMATRIX' for you:

float4x4 tTex: TEXTUREMATRIX <string uiname="Texture Transform";>;

You should use this semantic every time when you intend to use the transform matrix if this pin to transform texture coordinates.

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~4d ago

joreg: absolutely. if it is for a repo that is public, just submit a pullrequest. otherwise please start a forum thread.

~4d ago

benjawmino: @joreg I ended up figuring out BezierSegment yesterday, so nevermind! Tell me, could a user submit a help patch? :)

~4d ago

joreg: @benjawmino please elaborate on this question a bit in a new forum thread. otherwise it is hard to answer..

~5d ago

benjawmino: so are there no splines/curves in gamma yet??

~9d ago

skyliner: wanna do drone shows or applications? then check this super cool project of our man e1n

~13d ago

NoseBleedIndustries: Thanks Joreg! The few minutes I was able to see, very good workshops!

~13d ago

joreg: @NoseBleedIndustries please give us some days, we'll have an announcement soon...

~13d ago

NoseBleedIndustries: I could not assist the Node20 (workshops ) Any Idea when we will have access to the links of the recordings?

~15d ago

bjoern: unity has c# bindings for usd, under apache license: https://github.com/Unity-Technologies/usd-unity-sdk