Render depth to texture suffering Moiré pattern artefact

[robmar]

I´m rendering the scene depth to a RTT using the standard shader method to get a greyscale of the depth.

If I use it rendering to the standard frame buffer it works perfectly.

But if I render it to a RTT then I see this sort of moiré pattern, a splattering of pixels that have a very high depth level that move together as I spin the view or model.

I´ve spent hours going through everything but can´t find why the same shader used on an RTT causes this artefact.

Is this a known issue?

[vectorcorpse]

did u create a 32 bit float texture for the RTT and pass the data has float? if not u'll lose depth resolution since only int's will get stored on the texture.

[robmar]

Yes exactly, that worked well!