Hi,
your scene is not complete, you try to render a water surface without having anything below the water (to get shown by the transparency of the water surface) and without having defined the environment (to get shown by the reflectivity of the water surface).
For me it's a "none closed system", that means a ray from the camera to the scene does not find a defined end and so it does not have a defined color.
As sample: from your camera to the mid of the lake a ray is send to get a color for a pixel in the mid of the resulting image. The ray reaches the water surface and as water is defined e.g. 45% of the ray pass through the surface to find what material/color is below the surface and 45% are reflected (to the sky/clouds) to find what color is defined there, these 2 values + 10% of the water itself are then calculated to one mixed color for that point ... so 90% of the color is not defined, that's the problem of your render result.
Make the system "closed", so first define lightning (could be a sun), then define what is below the water, how is your sky defined (either by sky defintiion or a big, big sphere around your scene with a sky texture and I guess you will have success imediately.
Happy render, - alfred -
------------------------------------------------------------------------------------
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ...
blog.ish-solutions.at ...
LinkedIn ...
CDay 2025------------------------------------------------------------------------------------
(not an Autodesk consultant)