Corona Renderer for 3ds Max – How to Render Faster (Final Part)

Fixing Noise at “Corner Joints”

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For a geometry with no thickness, the edges where faces intersect can easily exhibit white speckles (for example, at a corner where the wall is just a flat surface with no thickness).

To fix noise at the corner joints, you can add a Shell modifier or create thickness for the geometry.

The simplest way to fix this issue is to add a Shell modifier to provide thickness to the geometry. Refer to the illustrative images for guidance.

Fixing Aliasing in Images

In some cases, especially at intersections of very bright and dark areas, jagged or aliased edges can appear. We can use several methods to address this issue, such as increasing Highlight Compression, using Sharpen & Blurring, employing Bloom & Glare, or a combination of all three methods.

Some Methods to Fix Aliasing at the Edges Between Light and Dark Areas.

In addition, there are less common methods, such as using the Image Filter Box instead of Tent, or adding the Highlight Clamping effect (mentioned in section 3). Refer to the illustrative images to see the results of using different anti-aliasing techniques.

Some Other Methods to Fix Aliasing Issues.

Dappled Bright Spots on Leaves

When rendering a scene with many small objects that have high reflectivity, white speckles can easily appear. These are actually reflections of the light source hitting the objects. We can fix this issue by reducing the reflectivity of the material or by turning off the Visible in Reflection option for the light source.

Fixing Dappled Bright Spots on Grass. While not technically noise, they can still be visually distracting

Moire Pattern

The term Moire Pattern refers to various maps, materials, or models that have closely spaced fine lines, creating high-frequency patterns. These patterns can produce a “flickering” effect or make straight lines appear wavy, resulting in a visually uncomfortable experience for viewers.

There is no completely effective solution in this case, as it ultimately depends on human perception. However, we can somewhat alleviate the effect by reducing the albedo of the textures and models that create the moire pattern to minimize discomfort.

Written by Dang Tien Dung

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