Shaders Only draw part of sprite that isn't blocked by a wall?

[Divinik]

I have a cone of vision for my enemies, and I want it so that the part of the cone that is through a wall doesn't get drawn, and maybe also have a line drawn where it is colliding.

Something like this:
https://drive.google.com/file/d/1sYwbd0rosreMgZuA9t8khvZcK9nfsyTm/view?usp=sharing

Any ideas would be great.

 

[woods]

something like...?

collision with vision_cone{draw_alpha}

 

[Divinik]

something like...?

collision with vision_cone{draw_alpha}

Would you be willing to elaborate?

 

[woods]

i misunderstood your post... more likely raycasting would be what you are looking for.. but is definitely out of my scope. sorry that im not of help on this one ;/

heres a semi relevant thread that might be of use..
https://forum.yoyogames.com/index.php?threads/enemy-line-of-sight.12888/

https://www.redblobgames.com/articles/visibility/

edit:

found another one on google searching for line of sight..

http://www.davetech.co.uk/fovtechdemo

 

[Divinik]

i misunderstood your post... more likely raycasting would be what you are looking for.. but is definitely out of my scope. sorry that im not of help on this one ;/

heres a semi relevant thread that might be of use..
https://forum.yoyogames.com/index.php?threads/enemy-line-of-sight.12888/

https://www.redblobgames.com/articles/visibility/

edit:

found another one on google searching for line of sight..

http://www.davetech.co.uk/fovtechdemo

Thanks man, I'll look into these!

 

[Yal]

Here's an idea:

• Get the angles of the FOV cone
• Loop over the angles with some good step size
• For each angle: loop from 0 to the max length of the vision cone. Check for wall collisions using lengthdir_x/y to get the point this far away from the start of the cone along the current angle, and if you find any, abort.
  
• Draw individual triangles based on these lengths; they together constitute the full vision cone.