@woland , Thank you all! 

I did it again, with attention to follow your cmd+A to get all the text, and effectively its now the line 34 that has a problem...but stil not compiling...with same < error message...

is it because the textures are not present (line 40 & 46 on shader toy)? 

      vec3 from=vec3(0.,0.,-2.+texture(iChannel0,uv*.5+iTime).x*stepsize); //from+dither

     float tx=texture(iChannel0,uv*.2+vec2(t,0.)).x*displacement; // hot air effect

Hi Woland!

I already tried that, but is not working:

Hello,

There is this amazing shader on shadertoy called "Bloody" that, if I understand well, is extruding a video feed onto a liquid surface, giving the impression that people are "getting out of the bloody liquid".

I'm having a hard time using shader on my machine, so I have the feeling we could do that with Isadora actors and with a B/W video feed... but how?...

I can't remember witch actor gives volume to another video depending on luminosity ...

I have something "ok" with the Displace actor (old CPU actor), but I thing better can be achieved...any idea?

Thanks for your help!

@tease said:

The first on is Hot Shower  :  https://www.shadertoy.com/view... (+copied as .txt here)

This works fine for me too on an Intel Mac running Mojave. Before you paste the code into the GLSL Shader actor are you pressing Cmd+a to select all the text (so that when you paste in the text it replaces *all* the text that was previously in the GLSL Shader actor)?

@tease said:

Line 36 refer to the void main image:

    void mainImage( out vec4 fragColor, in  fragCoord )

When I paste the code for this shader into the GLSL Shader actor (replace everything that was there before), this code lives in line 34, not 36.

@dusx My concern is that it is always the same error that I get, even entering shaders that Marc in entering without change and without problem on his guru session!

@tease said:

<

 The error suggests there is an extra OR missing '<' character. I would need to see the code entered into the editor to help further.

@gpeddino said:

I tried using the Timecode Comparator to trigger new values but I just couldn't make it work.

The trick to using the Timecode Comparator actor is that you usually want to set its 'compare' input to 'ge' (greater than or equal to). 

The default setting is 'eq' (equals) but timecode values move so fast that you won't get a trigger out of the Timecode Comparator unless you're doing something unusual like jumping to a set of specific timecodes and freezing the movie.

'ge' triggers when you're at or past the timecode value you've set up for the trigger, so it basically acts like 'eq' anyway.

@clafarge said:

Note that it's always correctly seeing the intended selection... it's just not dropping the selection in List Selectors that are being sent "0".

It may not be de-selecting them because even though you're sending "0" to Control ID's 22, 24, 26, and 28, you're still sending text on Control ID's 23, 25, 27, and 29.

Try sending it "0" or blank text on Control IDs 23, 25, 27, and 29 when you want to de-select.

@danielpineiro

I would imagine that you need to increase the number of channels on the OSC Multi Listener to 51 and just use the data that interests you from its outputs instead of trying to have Isadora route 51 channels of OSC in real-time through a single Router actor.

@gpeddino

I have to run to a meeting, but this should do want you want: https://www.dropbox.com/s/paze...

Basically I made a User Actor to trigger when you pass a certain timecode, then made all those User Actors send a "2" to a Calculator if the condition becomes true.

The Calculator also gets a "1" if the current subtitle text is not blank so if the result of the Calculator is "1", we know it's a regular subtitle and if the result is "3" we know it's a special subtitle.

Every time there's no text it resets both inputs of the Calculator (and the Gate feeding it "2's" from the User Actors) to "0" to prepare for the next subtitle.