LightPoint - Light intensity?

Dwight · 10-20-2020 03:50 PM

Hi all,

Back to Esenthel after a coding workshop, and things are going great! I am creating some game objects, of which one is a particle that also emits light. Shown in the attached image.

However, the edges are quite "hard". Is there a way to soften the edges of a LightPoint? LightPoint takes a Vec(3) as parameter, excluding a possible alpha?

How would I tackle this?

Code:

virtual uint draw()

   {

      if(particles.is() && Frustum(Ball(1.8f, particles.matrix.pos)))

      {

         Vec pos; flt opacity = particles.opacity(&pos);

         LightPoint(0.03f*opacity, pos, Vec(colorl), 0.1f, 0, 0.1f).add(0.0f, this);

      }

      return particlesVisible() ? IndexToFlag(particles.renderMode()) : 0;

   }

Drawn in RM_PALETTE.

**Esenthel** · 10-20-2020 04:12 PM

Hello,

Are you sure the hard edges are because of the light and not a particle?

Because I don't have a problem like this with LightPoint.

I'll do some tests though.

If you are sure, can you please provide a reproducible test-case (a sample project so I can test it, or you can modify some tutorials from the engine to reproduce the problem).

Yes the lights take a Vec param without alpha, because alpha is useless for lights.

If you want to fade a light, you can just multiply the Vec color by a Flt alpha.
Since it's in linear gamma, then better use Sqr(alpha), example:
Vec lin_col=Vec(1,1,1)*Sqr(alpha);

Also, what's your 'colorl' value? is it around in range 0..1? Or much bigger? like 100 or something?

Dwight · 10-20-2020 04:38 PM

(10-20-2020 04:12 PM)Esenthel Wrote: Hello,

Are you sure the hard edges are because of the light and not a particle?

Because I don't have a problem like this with LightPoint.

I'll do some tests though.

If you are sure, can you please provide a reproducible test-case (a sample project so I can test it, or you can modify some tutorials from the engine to reproduce the problem).

Yes the lights take a Vec param without alpha, because alpha is useless for lights.

If you want to fade a light, you can just multiply the Vec color by a Flt alpha.
Since it's in linear gamma, then better use Sqr(alpha), example:
Vec lin_col=Vec(1,1,1)*Sqr(alpha);

Also, what's your 'colorl' value? is it around in range 0..1? Or much bigger? like 100 or something?

Hi Esenthel,

Thank you for the fast response!

colorl is defined as "colorl = obj.getParam("LightColor").asColor().v3;"

In the case at hand, it's Vec(0.251, 0.0, 0.0). Although now with the multiplication of Sqr(0.5f), the edges have greatly improved!

Thanks again!!

**Esenthel** · 10-20-2020 04:40 PM

This patch:
https://github.com/Esenthel/EsenthelEngi...d7d353dc9e

Should help with the problem, however your image looks like it has much bigger problem than it should.

Dwight · 10-21-2020 10:12 AM

(10-20-2020 04:40 PM)Esenthel Wrote: This patch:
https://github.com/Esenthel/EsenthelEngi...d7d353dc9e

Should help with the problem, however your image looks like it has much bigger problem than it should.

"Bigger than it should" sounds quite reassuring! pfft

LightPoint - Light intensity?
Author	Message