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Why if you set an actor's transparency to 1...it can't receive collision event???moreover physical response???

Because it needs "visual" contact. Remember, transparent png's also doesn't collide.

To make invisible actor which can collide: create actor -> visibility state -> don't draw but allow events

I think that way just for "invisible-forever" actor...how about "invisible-forwhile" actor???

well, you can use that in any event. For example:
collision -> any side of lizard -> visibility state -> don't draw but allow events
etc, etc

Because GE draws the actor again and again in automatic draw actor event. Well, not 100% automatic because there must be the "create actor in the beginnin" set.

Well, I wouldnt know the result before try it...thanks anyway...

I have found that if you want an invisible actor to collide, make it's transparency .99999 instead of 1.0. You can't see .99999, but it will collide.

There are many ways to do this:
1, would be to stamp a wireframe on him then use that as the collision, 2 would be to "code" a collision box and when the player's X/Y reaches that box it sends a variable deactivating the players directional velocity.

Lol guys, this is 3 years old topic, I think Bee-Ant has already solved the problem.. xD

Lol yeah

r u shure he may still need help he never said he got it to work

try setting the objects transparency to 0.9999999, that way it IS visible but hardly... it is so un-visible that you cant see it unless it is against a contrasting background... then its like a shadow... barely noticeable.

A 100% transparent actor is still visible.
Clone an invisible actor over it self many times, and change the BG color to white, you'll see what I mean. Yet, no events regarding interaction happens

lcl wrote:Lol guys, this is 3 years old topic, I think Bee-Ant has already solved the problem.. xD

Indeed.
For everyone insist on help, thanks. But the problem already solved since Troodon posted his last reply, 3 years ago

Game A Gogo wrote:A 100% transparent actor is still visible.
Clone an invisible actor over it self many times, and change the BG color to white, you'll see what I mean. Yet, no events regarding interaction happens

Indeed.
I got this when using ghost effect with canvas, in the bright colored background...
The square shape still visible, whereas I used erase(0,0,0,1); on the canvas that supposed to make it completely transparent...