object displacement shadows

[KyL]

Hey folks,

I am having an issue with object displacement (RTO off).
Scrolling through some old thread I learned some tips and tricks but couldn't get an answer to my issue. First let's start with a picture.
[attach=1]

Here the edges of the objects are exploding because there is not offset in the displacement, so everything is displaced upwards. This is a normal behavior.

However when I change my displacement to have a correct offset and fix this issue, this happens:
[attach=2]

The edges are correct, but now something is definitly wrong with the shadows. I tried to see if I could change the shadow bias of something related to the displacement bounds but I couldn't fix it.

The object is correct, vertices, normals, more faces at the edges.... everything looks good. I assume this is normal behavior caused by some limitation in the displacement of imported meshes, as I could remember from reading old threads, but maybe there is a workaround?

Here is the object if anybody wants to take a look
[attach=3]


Cheers!

[Oshyan]

How *much* are you displacing? Remember displacement is measured in *meters*.

- Oshyan

[KyL]

I depends on the texture, but I am displacing with a value that makes sense in real life. For this one I am displacing at 0.08, so 8cm. The offset is -0.04 so I have the middle point of my displacement map at the level of the undisplaced surface.

[Oshyan]

And how big is the object?

- Oshyan

[KyL]

A bit more than 2m tall, you can check the .tgo I joined in the first post!

[Matt]

It's the same problem as in this thread:

http://www.planetside.co.uk/forums/index.php/topic,20213.msg200683.html#msg200683

It goes dark with negative displacement because the shadows are cast from the non-displaced object. This is because the ray tracer (which is used for shadows) doesn't support displacement on imported objects yet. It requires a big change to the renderer to support this, but it is on the roadmap for the future.

Matt

[KyL]

Ok that's what I thought.
So even with RTO off, shadows are still raytraced. Good to know. I can imagine why this limitation is not trivial to remove...

Thanks for the link and the help Matt!