How to make a glowing icon on a HUD?

Questions & Answers
1

Hi,

I'm trying to make an icon on my HUD glow like a warning sign. A sine wave would be very good, but I have no idea how to implement one. Right now I'm using GUI.DrawTexture.

Thank you.

4

Look at both GUI.color and Mathf.PingPong. You can change the alpha of the GUI color with something along the lines of

GUI.color.a = Mathf.PingPong (Time.time, 1);

just before you call `GUI.DrawTexture`. If you want to have a minimum opacity higher than `0`, though, you'll have to write your own PingPong function.

When you've drawn your texture set

GUI.color.a = 1;

Note that direct modification to Color.a only works in Javascript-flavored scripting. If you're working in C#, you'll have to do something like

GUI.color = new Color (GUI.color.r, GUI.color.g, GUI.color.b, 1);
2

Make a image in Photoshop (Or whatever) and then add it to Unity...

3

Since there seems no way to change the opacity of a GUITexture (someone correct me if I'm wrong), you won't be able to make it glow by changing the opacity.

Therefore I assume that the only way to achieve a pulsating effect would be to produce a series of images with the changing glow and cycle through them.

5

You can change a GUITexture opacity over time by altering 

GUITexture.color.a

For example:

function AnimateGUITextureOpacity (start : float, end : float, length : float, target : GUITexture) { 

for (i = 0.0; i < 1.0; i += Time.deltaTime*(1/length)) { //for the length of time

target.color.a = Mathf.Lerp(start, end, i); //lerp the value of the transparency from the start value to the end value in equal increments
yield;
target.color.a = end; // ensure the fade is completely finished
    } //end for

} //end function

will lerp the opacity of a GUITexture over time with a start and end value and speed you define as well as the specific GUITexture you want it to apply to.