[Xavier Gomez]

normal of the plane parallel to v1 and v2 (up to sign): normalize(cross(v1, v2));
v1.v2 : dot(v1,v2);

To get all methods (math or not) available to expressions, enable the expression of a property, and click the triangle near the = sign.
It opens up the menu.

Xavier.

[Xavier Gomez]

p1 = effect(“3D Point Control”)(“3D Point”);
p2 = effect(“3D Point Control 2”)(“3D Point”);
normalize(sub(p2,p1)); // unit vector

If for some reason you need both the length and the unit vector
v = sub(p2, p1);
L = length(v);
u = L==0 ? null : div(v,L);

// you can use p2-p1 instead of sub(p2,p1), etc, AE supports it.

Xavier.

[Xavier Gomez]

This idea already appeared somewhere in the cow forums, but thanks for posting.

On a side-note, it is hard to understand why the Write-on effect is so desperatingly s-l-o-w when lowering the (temporal) brush spacing. 0.001 corresponds to 1000 particles/sec, it is not that much. Paticular can handle 1000 x that and doesnt freeze like Write-on…

[Xavier Gomez]

app.project.activeItem.layer(1).effect("Both Channels")(1).expression = "smooth(0.2, 5, time);";

See this: https://forums.creativecow.net/readpost/2/911517 to see how smooth works.

Xavier

[Xavier Gomez]

The .value is useless indeed.
By bounding, i meant make sure that the result of the expression is between 0 and 100 (because completion is a number 0 and 100) but the effect takes care of it so there is nothing to do.

Now for the other part, it depends what you actually want to do. Specifying slider=100 <==> completion=50 is not enough to write the expression… if you also specify slider=0 <==> completion=100, and that the values vary linearly, then :

Math.max(100-0.5*slider, 50);

(slider<=0 : 100, slider>=100: 50).

[Xavier Gomez]

100-effect(“Slider Control”)(“Slider”).value;

Normally you should bound the resulting value to [0, 100] but no need since the completion property deals with it.

Xavier.

[Xavier Gomez]

Hi Jacob,
you just need to use the add/remove methods of your groups/dropdowns.

var myDD = my_palette.grp.firstRow.g01.renderSettings;
// remove all items:
while (myDD.items.length) myDD.remove(myDD.items[0]);
// add new
myDD.add(“item”, “new menu item”);
// etc

Same for groups, but in that case, if you don’t specify the new widget location/size, or bounds, you need to run the autolayout after the change:
myPalette.layout.layout(true);

Xavier.

[Xavier Gomez]

For the second way, to find a menu command ID, do

app.findMenuCommandById(commandName) // returns an integer, (0 if not found)

for “Deselect All” is gives 2004.

Then you inject that number in app.executeCommand(commandId);

You’ve got to be very sure of what panel is active and what item/layers/properties/etc are selected before using these… For “deselect all” a mistake is quite harmless, for “cut” it is another story.

Xavier

[Xavier Gomez]

// (comp should be a CompItem)
var selLayers = comp.selectedLayers, n=selLayers.length;
while (n–) selLayers[n].selected = false;

// or, if you are sure that app.project.activeItem is a comp opened in a viewer
app.executeCommand(2004); // “Deselect All”

Xavier

[Xavier Gomez]

Ease ease is still quite simple, other than that could be difficult to explain/manage…
The KeyframeEase object requires 3 components (X,Y,Z), even in 2D, can’t figure out why.
Also, you don’t need the speed, influence, easeIn, easeOut variables below, they are there just to tell the meaning of this things inside the parenthesis.

Xavier.

var BEZIER = KeyframeInterpolationType.BEZIER;
var LINEAR = KeyframeInterpolationType.LINEAR;

var speed, influence, easeIn, easeOut;
var ease = new KeyframeEase(speed=0, influence=33.33333);
var key1, key2;
var myScale = app.project.activeItem.layer(1).property("scale");
// set the values at times
myScale.setValueAtTime(0,[0,0]);
myScale.setValueAtTime(1,[100,100]);
myScale.setValueAtTime(5,[130,130]);
myScale.setValueAtTime(6,[0,0]);
// get the key indices and set the rest
key1 = myScale.nearestKeyIndex(1);
key2 = myScale.nearestKeyIndex(5);
myScale.setTemporalEaseAtKey(key1, easeIn=[ease, ease, ease], easeOut=[ease, ease, ease]);
myScale.setTemporalEaseAtKey(key2, easeIn=[ease, ease, ease], easeOut=[ease, ease, ease]);

// (optionnal) overwrite outter tangents (Bezier ---> Linear)
myScale.setInterpolationTypeAtKey(key1, LINEAR, BEZIER);
myScale.setInterpolationTypeAtKey(key2, BEZIER, LINEAR);