Self Illumination in vray..

[shikodesign2000]

Hi,

 

Is there an option in vray like "self illumination" in standard materials??

 

Thanks,

Sherif Massoud

http://www.3dshore.com

[Fran]

You could try putting an Output map in the diffuse channel of the Vray material. In the Output parameters, increase RGB Output.

[eksg]

Are you pertaining to the V-Ray Light Material?It is self illuminating,actually it also acts as a light source itself when applied to an object.

[jophus14]

You could just use a self-illuminated standard material in Vray. A Vray Light has to calculate like a regular light would. With this being said, if you have a lot of objects with a VrayLight material on them, it will make your image longer to calculate and render out.

[Christopher Nichols]

You could just use a self-illuminated standard material in Vray. A Vray Light has to calculate like a regular light would. With this being said, if you have a lot of objects with a VrayLight material on them, it will make your image longer to calculate and render out.

 

That is incorrect. A VrayLight material is JUST like a self-Illumination, and will render faster than using a standard material with self-illumination. Also, the VrayLight material will only illuminate the scene in diffuse if you use GI, otherwise, you will only see it's effects in Specular.

[jophus14]

Why is when I used VrayLights to light an office ceiling with about 50 lights in it, it took much longer for the LightCache and Irr Map to calculate? I thought that geometry with a VrayLight material applied has to be calculated as a "light" object?

[Christopher Nichols]

It takes longer because of the brightness of the scene. The brigher the scene, the longer the rendertimes. Rendering something bright takes longer in than rendering something dark. Also keep in mind that when doing GI... all objects are light sources. That is the whole point of GI.

[eksg]

It takes longer because of the brightness of the scene. The brigher the scene, the longer the rendertimes. Rendering something bright takes longer in than rendering something dark. Also keep in mind that when doing GI... all objects are light sources. That is the whole point of GI.

 

ok...is that a fact,or your just making it up.hehe,just kiddin.yeah,theoretically, that's right.because a bright scene must have a lot of light bounces and it would show a lot of details,rather than a scene hidden on shadows.but im not a technical guy,im a caveman that knows how to make a fire but really doesnt know what it is.

 

but what we havent asked is where he would use the self illumination.probably our guy here just doesnt know that a v-ray light material exist,or he just wanted a glowing object but not necessarily affecting the scene lighting.am i right Mr Sherif Massoud?

[Fran]

I don't recommend the VrayLight material because it introduces a lot of artifacts into the scene. If you just want something to look lit up, like a tv screen or an led without actually contributing light or taking up calc time, I would use the Standard mat with self-illumination enabled. If, in some cases (?), a Vray material is necessary, use an Output map. If the material already has a bitmap in the diffuse slot, adjust Output in the Bitmap parameters.

[eksg]

I don't recommend the VrayLight material because it introduces a lot of artifacts into the scene. If you just want something to look lit up, like a tv screen or an led without actually contributing light or taking up calc time, I would use the Standard mat with self-illumination enabled. If, in some cases (?), a Vray material is necessary, use an Output map. If the material already has a bitmap in the diffuse slot, adjust Output in the Bitmap parameters.

 

Hi there Fran,its a nice tip.actually,i noticed that when i uses the v-ray light material,i always have those what you call "artifact".But how about covelight,have any tip on that,or should i stick with the v-ray light material.

[Fran]

Hi there Fran,its a nice tip.actually,i noticed that when i uses the v-ray light material,i always have those what you call "artifact".But how about covelight,have any tip on that,or should i stick with the v-ray light material.

 

 

Hi. If you are trying to simulate neon or some other exposed luminaire, you may be stuck with having to use the VrayLight material. The GI quality settings have to be really high to keep from getting splotches. If I can get away with using a Vray Light, I'll always opt for that.

[FlytE]

I find there are only certain circumstance where a vraylightmat is all that good. In my experience in order to get any decent illumination from it you need to bump up the settings which result in either burnout or a 'whitening' in the colour of the light. There doesnt seem to be much of a compromise. I might give the standard mat a try and see how that pans out