Rendering Tip - Use Reflective surfaces

solo

Luckily she is not wearing a skirt.

Rich O Brien

Or if it's a 'He' we're even luckier it's not a Kilt

Al Hart

Luckily she is not wearing a skirt.

But I think it is an impressive rendering for a new user who is trying to find a way to get reflection without having to use an external rendering engine.

Actually, there is a similar trick where you put the camera below the floor, grab an image, and merge the image into the floor texture. This could easily be done with a ruby (are you listening Chris F. ?)

kwistenbiebel

Reflection, glossiness, fresnel ,to show what each parameter does.

Reflection and glossiness probably speak for themselves.
'Fresnel effect'= the fact that the amount of reflectance you see on a surface depends on the viewing angle.

(values are Vray )

materials with a very high IOR(index of refraction), such as metals:

For unbiased render engines like Maxwell, other specific variables like 'roughness','ND' etc.. are used.

Gaieus

@solo said:

...Luckily she is not wearing a skirt.

OK, joking aside. Indeed in reality, every material reflets light (otherwise we could not see them obviously). As was pointed out above, there are several parameters that need to be taken into account. Most important is how it reflects light (that's governed by the IOR value - i.e. it will be a sharp, pointy reflection with higher values or more dispersed with lower ones) and the shininess (i.e. the amount of this reflection).

Now here is an example below where there is the outside with the physical sun shining direct sunshine (the direction is shown by the red arrow from the door) and the indirect kind of lighting "shone" by the physical sky (this is practically coming from every direction but of course, "pinholed" by the openings).

It is very interesting to see how a rather flat brick texture still reflects direct and indirect light as well and causes different, multiple reflections say on the left, when the light from the door first hits one column which then reflecting (but with low IOR, also dispersing) this sunshine and lighting the other column (that's what we can see on the left) as well as the wall all around.

The more indirect sky light is lighting everything more subtly but gives an overall "global illumination" to the scene and only reflects when our eye is directly exposed to the reflections caused and directed by the IOR (these are marked with blue).

The whole mixture of these bouncing photons will eventually give the "photorealistic" feel of a render (this particular one of course does not claim to be a real PR render - not to speak about the still untextured walls and window frames).

Obviously a "newbie mistake" is to overdo shininess (and I am still in this newbie phase of course) but reflection is not (necessarily) about visible shininess but about such multiple, bouncing reflections.

And please, everybody excuse me now for this post as I am really inexperienced at rendering.

Al Hart

@gaieus said:

And please, everybody excuse me now for this post as I am really inexperienced at rendering.

Good - if watching us all argue about this tip gets you to try some more renderings than we have had at least one positive effect.

You might appreciate this next weeks tip: Use 2 pt perspective for better vertical alignment

(Unless, of course, the columns are actually placed at an angle. You do not seem to have the camera pointing up or down)

Al Hart

@kwistenbiebel said:

And the tip for the week after that:Tip Of the Week after next week

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@unknownuser said:

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Thanks,

Maybe I can learn something from this.

kwistenbiebel

@al hart said:

You might appreciate this next weeks tip: Use 2 pt perspective for better vertical alignment

And the tip for the week after that:Tip Of the Week after Next Week.

.

kwistenbiebel

sorry, couldn't resist

sepo

Gaieus

@al hart said:

You might appreciate this next weeks tip: 2 pt perspective for better vertical alignment...

No, they are not at all placed in angle - here is a "real ortho" (parallel projection) view...

I am (of course) not happy with some of the procedural textures yet...