Lighting influence on rendering bitmaps

[charlieinolas]

Hi,

 

Any clue if it's possible to exclude an object (with bitmap on it) from lighthing, exposure etc, so that the bitmap retained its original brightness and colors after the render is done ? In other words - so that any light, camera f-stop etc. would not affect this bitmap?

 

In my case it's 3ds max.

 

 

thx!

[heni30]

you might try a Standard material bitmap with color and opacity set to 100%

[charlieinolas]

Left one is rendered, right one is my goal (original look - here diffuse pass).

It's too dark. And still, when I change the exposure settings under camera rollout, it affects the look of my bitmap, so that's not it.

[Francisco Penaloza]

Use a VRay material overwrite, and change the influence of GI and lighting.

You can also exclude that object from being affected by GI or shadows, that it is in object properties and in V Ray properties, right click on the object.

or use a V Ray light material.

[charlieinolas]

Ok, I'll post the link to other thread where I already asked and they dindn't find the answer.

 

http://forums.cgarchitect.com/77865-lighting-influence-rendering-bitmaps.html

 

I used those methods You described but still it doesn't work as it should.

[Francisco Penaloza]

Here is the thing, I believe that your problem is gamma, check the gamma input in your image, render with no light, if then it look OK, then it should render fine, now this won't give you the same brightness that you have of your single image because the software is doing exactly what it should, applying light and shadows to your texture to fit the scene.

You can also eye bowling the RGB values in the bitmap options in your texture to fine-tune the brightness .

You can also load that image with a HDR VRay shader and adjust gamma and levels there, but if your image is 8 bit only you won't get too far.

 

You can exclude from lights and shadows within Max, you can't exclude from camera exposure.

If you exclude from lighting, then you need to use a V Ray light material to load your texture and adjust the intensity.

The best thing will be render per passes, background first, then render only your girl and comp together in photoshop, or whatever.

[Tommy L]

Use VRayLight material.

[Scott Schroeder]

Vray light material with compensate for camera exposure checked. And/or render your people out in a separate pass with things like GI and lights disabled.

[siddharthkolte]

Oh wait... did you check if the normals of the plane you are using the girl on is facing the camera, bcos that is why you might be getting a black render of the girl when you use the VrayLightMtl, if you want to test it you can tick the option in the material Emit Light on back side.

[charlieinolas]

Guys, did You read the link to the thread I post before?

I described everything - that I used proper gamma, that I used VrayLightmtl and how, that I already excluded from lights.

It's not working properly. Either I'm missing stgh or it's not generally possbible to have it rendered with exact original look.

 

Attachment below.

Images are not the same.

Edited February 24, 2015 by charlieinolas

[charlieinolas]

I solved the problem. At least partially.

Instead of using expotential mode like I had all the time, I used 'linear.

It made slight changes to the background but the girl looks fine now.

 

Thanks everyone for help.