How do I use blend modes to reveal hidden objects?

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- TobyeRyan
- - Joined 30 Jan, 2012
  - 17 topics • 45 posts
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- 20 Nov, 2020
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Sorry for the newbie question but I spent a lot of time on it today and for some reason I just can't get it to work.

I want it so that when a 'spotlight' is overlapping a 'hidden' object, the portion of the 'hidden' object that is overlapping the 'spotlight' will be revealed. I want the 'spotlight' object to be invisible too, it will only be used to reveal 'hidden' objects (which are also invisible until the spotlight is on them).

Additionally I also wanted to do the opposite - so 'hidden' objects are visible but become invisible when overlapping the 'spotlight'.

Thanks in advance for anyone who can help my confused brain!
- HolidayExplanation
- - Joined 27 Sep, 2015
  - 130 topics • 414 posts
- 1
- 20 Nov, 2020
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You can use SourceAtop Blend mode on sprite that you want to be revealed, the sprite needs to be on top. The Layer needs to be set to Force Own Texture for it to work. In Construct example project files you have a file called Blend modes where it shows you what each does.

https://drive.google.com/file/d/1LdxudkyHxgdjjNnEEUE4kyI4jOvupqnj/view?usp=sharing
- TobyeRyan
- - Joined 30 Jan, 2012
  - 17 topics • 45 posts
- 1
- 20 Nov, 2020
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Thanks mate! I works like I want except the 'spotlight' object is still visible. I tried changing the opacity and whatnot but can't solve it. Is there a way to do it or is it just not possible with blends?
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- HolidayExplanation
- - Joined 27 Sep, 2015
  - 130 topics • 414 posts
- 1
- 20 Nov, 2020
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I can't say exactly if it fits since I haven't seen your game, but you could set the Spotlight to be the same color as the background.

https://drive.google.com/file/d/1pYEEryc_a-M74lhymztmP8KEGj3WWBOn/view?usp=sharing

Alternatively you could try using Source In if it fits better.

https://drive.google.com/file/d/15i50pdBT1Ar6mPKHXtHLrNFnky98WDtw/view?usp=sharing
- TobyeRyan
- - Joined 30 Jan, 2012
  - 17 topics • 45 posts
- 2
- 21 Nov, 2020
- Quote
Thanks, but none of them are really fitting the bill. I'm after an invisible object that will make the overlapping portion of another object visible.

The effect of revealing the hidden object works in your first reply, but I can't find a way to make the 'spotlight' object invisible and still have the desired effect.

Thanks for your help but I'll just try a different approach, I spent quite a bit too much time on it already and I can get similar enough results going a different way ^^