Messages

1

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-19, 10:12:15 »

As I mentioned before, if it's not possible to render the shadows together with the objects - we'll render them separately, but our main concern is that the shadows without the environment map on a backplate don't look realistic - they are solid black or gray. And in my attempts I even rendered the HDRI map of the room and used it for a backplate, but I got strange light reflections around the places, where metal (or other reflective surface) touches the shadowcatcher. But this works only for static render. And we need these shadows for video production.

2

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-19, 10:08:28 »

Have you tried any other options?

3

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-13, 11:14:14 »

Found some more bugs, when rendering with the HDRI on Environment and backplate.

I added one more object on the right. The area, where the reflective legs of the chair contact with the shadowcatcher mtl, there are some odd bright reflections instead of shadows.

Attachtments:

1. Panoramic view with the bed and the objects on the right (combined 3 pictures - panoramic render of the room with the bed, exr layer with shadows, but again the objects don't look realistic, realistic objects on top of exr layer)
2. exr file on top of panoramic render (you can see, that the objects don't look right)
3. realistic objects on top of exr file (rendered in the room, in the right environment and lighting)
4. Reflections, that look odd
5. Render of the room with realistic shadows, made in a room with walls, floor, ceiling, with Corona sky environment and Corona sun (How the shadows should look)

Rendering the shadows this way solves only a part of our problem.
As the object, rendered in HDRI environment and with HDRI backplate in Shadowcather MTL doesn't look realistic enough, we can't use it, we can only use the shadows, but need to render the objects in the room (the realistic environment) and combine them. That can work, but the bright reflections around the reflective objects, like on the samples attached still don't look fine.

Also, this way doesn't work for video production unfortunately. I'll post the examples in the next post.

4

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-12, 21:03:36 »

Another option that I tried:

Rendered the panoramic view of the room, made HRDI of it, deleted walls, ceiling and floor, left only the bed and the planes with Shadowcatcher. I made everything same, as in the Video tutorial, attached in the first post, but I couldn't get the same result, as in the tutorial. The object isn't shaded properly - you can compare it with the bed, rendered in the room (attachtment #4)


Attachtments:
1. Panoramic view, that is used for HDRI
2. HRDI map
3. Bed with the shadows in .exr format (The shadows under the bed look ok, but the object looks not realistic enough
4. Realistic bed render, that was rendered inside the room - for comparing with the bed in .exr format.
5. The Sadow catcher mtl, Environment, HDRI
6. The result that I got, combining the exr file, the walls and the realistic object on top of the exr file

5

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-12, 11:59:01 »

Second option - "Cast shadows" checked in floor/walls/ceiling object properties, as they should affect the shading of the object.
Attachtments:

1. Object properties of the floor/walls/ceiling
2. Object properties of shadowcatcher surfaces, that cover floor, walls, ceiling
3. Shadowcatcher mtl
4. The result I got in PNG
5. The result put onto the empty room render

Concerns:
Checking "cast shadows" in walls/floor/ceiling object properties affects the object rendered - it becomes realistic, but it also affects the shadowcatcher surfaces, that become not transperent.

6

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-12, 11:49:49 »

I tried to use different object properties of the walls/floor/ceiling and the surfases with the shadowcatcher.
Attachtments:

1. Object properties of the floor/walls/ceiling
2. Object properties of shadowcatcher surfaces, that cover floor, walls, ceiling
3. Shadowcatcher mtl
4. The result I got in PNG
5. The result put onto the empty room render

Concerns:
Unchecking "cast shadows" in walls/floor/ceiling affects the object rendered - it is lit only by environment and looks unrealistic. Also, for some reason the shadows of the shelves on the wall are yellow instead of being dark, solid, not transperent shadows under the bed.

7

[Max] I need help! / Re: Using Shdow catcher mtl in complex interior scene

« on: 2017-01-12, 11:35:03 »

Hello, guys,

1. Misha is helping  Kucheriavyi to solve the problem.

2. Yes, that's the main goal.

what we're trying to achieve is to get a realistic object and it's shadow in the same render, but for now I can't get it. The files, that I attached are the previous method, when the shadows and the objects where rendered separately and I combined them in Photoshop. The thing is, that the shadows are black and solid and aren't transperent, which is not realistic. To make them them realistic, I need to edit every single shadow in Photoshop, or After Effects, or whatever, but if I need to make 30 rooms, 5 such layered objects with shadows in each room - I need to work on 150 objects, and if I have to create 3 videos per room, 60 frames each, that means, that I need to edit 27 000 frames (or shadows of the objects). That's why I'm trying to find the way to get realistic transperent shadows instead of solid black, that I get for now. And I'm trying to find the way to render the shadows together with the objects.

The method, that is used in the video tutorial works well with the environment backplate, but I don't have such beckplate, my environment is a room. Also, that method works well in a simple environment, like 3 boxes and a teapot, but when I try to apply it in a room, I get unrealistic objects and unrealistic shadows.
The attachtments in the first post are the examples of how I worked previously, I wasn't able to add more in the same post. I'll attach the results that I got in a few next posts.

We're using Corona 1.5.2

8

[Max] I need help! / Using Shdow catcher mtl in complex interior scene

« on: 2017-01-11, 22:18:58 »

Hello, everyone,

I'm working on interior scenes, where the furniture and other objects are separated from walls, floor and ceiling. When working on a single render I used "Viewport selection" to render the separate objects, but to create realistic transperent shadows, I copied the scene, applied the ShadowCatcher Mtl onto the ceiling, floor and walls and rendered only the shadows through alpha channel. I got solid black shadows as a result, after that I combined the objects and shadows, using Photoshop to make the shadows transperent. That works for a single render, but now I have to make the objects (including their shadows) separated from the walls, floor and ceiling in a video. That means, that I won't be able to use Photoshop in every render frame. I'm working on this project with a team of guys and we already tried everything we came up to get transperent realistic shadows in the interior, not having a backplate, as our environment is actually a room.

The purpose is to get the same result for composing, as in this video tutorial, but not having a backplate and having the objects placed in the room.

We tried to use the textures of the floor/walls/ceiling as the backplate, but instead of becoming transperent, the shadow begun to shine, also, if we put the object into the room, fully covered with shadowcatcher, the material affected the look of the object - the shadow in Alpha channel was rendered, as it should, but the object became dark, as it was set into the grey or black room.

Of course, it would be amazing to find a way to render the objects and their realistic transperent shadows in the same file, but if only rendering the tarnsperent shadows is real - we'll be more than happy.

Looking forward for your advice and help
Kindest regards
Halina