One "trick" to quickly get nice and "sharp" caustics is to lower the number of interpolated photons.
Make sure your water surface is set to "generate caustics" both in the instance properties, and that the material is set to "use refractive caustics" (do_refractive_caustics=1) and that caustics is on in the render options. This gives a wee bit of surface back (there is a bit of transition, that then goes darker by depth, which is both better than the hard transition in image 2, and the non-existent one in image 3), plus we actually see slightly (but just slightly) how the pool edge casts a shadow on the water. that leaves (1.0-0.9)*Diffuse amount of diffuse. So to get the same "look" you can set the diffuse to 1.0, and the transparency down to about 0.9. But the water preset really uses the "diffuse" to simulate a bit of scattering in the water (see how the very top image is a bit greenish, and you can actually see the shadow "on" the water). Now we have "replaced" this with transparency (since transparency is 1.0). We used to have a diffuse of 0.1 in the original water preset. Why? Because the energy conservation will only give as much "diffuse" as there is NOT transparency.
First of all, crank up your "Diffuse" to 1.0. This is nice, but now we have the opposite problem the surface is nigh invisible. Now, the color at the bottom of the pool (at the designated depth) is pretty much the same, but it fades towards that color, rather than immediately hitting it at the surface. If we change our transparency color back to white, and instead turn on the refraction "Color at Max Distance" (refr_falloff_on) and set the distance (refr_falloff_distance) to the depth of the pool, then enable the "Color at Max Distance" (refr_falloff_color_on) and set that color (refr_falloff_color) to the same "watery blue", we will get this result: The reason for this is that we used a transparency color, and as the manual says, intensity changes "at the surface of a solid" isn't really what reality does. Note how there is a very sharp transition from air to "underwater" which looks strange. While this is nice, it isn't very realistic. If we turn it up to 1.0Īnd set a transparency color of "watery blue" we get the following result: The simple fix is to simply turn "transparency" up. What it really shows you, is that water really doesn't have much color, it simply reflects the physical mental ray sky.Īnyway, what to do about seeing "into" the water? The intent for the preset is for nice quick ocean surfaces and similar. it does the reflections, but you can't actually see into the water, like thus: I was asked how to do more "realistic" water using the Arch&Design (mia_material) shader, since the available presets we ship is only for a surface, i.e.
0 kommentar(er)
