Irrlicht and light picking

[The_Glitch]

I have a strange issue with a shader that only uses one point light. I noticed if my app has more than one light else where in the scene the above issue in the video occurs as if it's having a hard
time selecting which light to use or stick with. Though in the shader callback I tell Irrlicht to use

Code: Select all

SLight light;
 
        light = driver->getDynamicLight(0);
 
        core::vector3df light_position = light.Position;

Only the first light. If I remove the second light and only have one light in the scene everything seems to work fine.

[thanhle]

Can't view your video as it is private.
Regards
thanh

[The_Glitch]

Sorry should have been public, I have to reload accidently deleted the duplicate upload check back later if you can I'll update the link.

[The_Glitch]

https://www.youtube.com/watch?feature=p ... Yno1j58HuM

**UPDATED

[The_Glitch]

I see I've trumped the community once more lol

[mongoose7]

It's a shader problem and you didn't post your shader code. What do you expect?

[The_Glitch]

I'm currently checking both ends I'll post the shader also.

[BlindSide]

I don't think it's the shader, Irrlicht will update the list of dynamic lights every frame based on which light picking strategy is used. If you want to stick with one light you can maybe just get the position from the ILightSceneNode instead.

[The_Glitch]

Yeah I already knew it was a Irrlicht side problem. I'm not sure why people always say it's a shader problem. If I only have one light in the scene the shader works as expected.

[mongoose7]

Irrlicht's handling of lights only becomes an issue if you have more than eight lights. I thought you had two! It sounds like *your* problem to me.

[thanhle]

Hi,
Last time I remember, the light switching occurs at some angle range even if you have less than 8 lights. That was the version in trunk.

I think there is a bug introduced somewhere between the version.
It could also be the normal or tangent of the model is not right.

May be test a different mesh by putting in the same location and orientation to see it is the same? Static a well as dynamic mesh.

Regards
thanh

[The_Glitch]

@mongoose7
If you say so. Right now I'm trying to overcome an issue in shader-pipeline right now.