Slowly fade texture only when when looking up?

Question

Hi,

This seems like it shouldn't be too hard but I'm kind of stuck.

I'm not too familiar with Vectors so I'm a little confused. I'm using the angry bot's texture fade script and I'm trying to modify it. I got it to fade when the player looks up, but it also fades when the player spins around at certain rotation angles. How can I make it so it only fades when looking up?

Here's the code:

#pragma strict

var cameraTransform : Transform; var glowColor : Color = Color.grey; private var dot : float = 0.5f;

function Start () { if (!cameraTransform) cameraTransform = Camera.main.transform; }

function Update () { dot = 1.5f * Mathf.Clamp01 (Vector3.Dot (cameraTransform.forward, transform.up) - 0.25f); }

function OnWillRenderObject () {
renderer.sharedMaterial.SetColor ("_TintColor", glowColor * dot);
}

Or this? Sorry for the weird format, I use the code paste but it doesn't work..

#pragma strict

var target : Transform;

var mistColor : Color = Color.grey;

private var angle: float = 0.5f;

 var targetDir = target.position - transform.position;

 var forward = transform.forward;

function Start () {

 if (!target)

     target = Camera.main.transform;

}

function Update () {

 angle = Vector3.Angle(targetDir, -transform.up) - 0.25f;

 

  if (angle < 90.0)

 renderer.sharedMaterial.SetColor ("_TintColor",  mistColor * angle);

 }

}

Answer 1

Best Answer

Answer by aldonaletto · Feb 02, 2012 at 03:37 AM

The dot product between two unitary vectors result in the cosine of the angle between both. This means that the dot product will return a number between 1 (when the camera is parallel to the other vector) and -1 (when pointing to the opposite direction). In the first script, you could just use Vector3.up as the second vector, like this:

...
function Update () {
    dot = 1.5f * Mathf.Clamp01(Vector3.Dot(cameraTransform.forward, Vector3.up)-0.25f);
}
...

Using transform.up like in the original code could give strange results if the object was not in the upright position.

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BHS · Feb 02, 2012 at 04:39 AM 0

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Thank you so much, I get it, but it fades when I look down, I want it to fade when I look up. I tried Vector3.down and -Vector.up but neither worked..Any way to fix this?

Edit: Never $$anonymous$$d got it I just used cameraTransform.up ins$$anonymous$$d of cameraTransform.forward.

Thanks again, you've earned this.

Slowly fade texture only when when looking up?

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