Notes on the Opensubdiv subdivision function in 3DSMAX

When it comes to modeling and segmentation, it is estimated that 3dsmax students will be haunted, each time adding "turbo smooth" or "mesh smoothing" before, will be subconsciously save, no reason, is because it is too easy to hang up the software.

Not to mention that after the turbine is smooth, the extra line makes the whole scene in a very stuttering state, especially when the wireframe mode is turned on, and there is no desire to continue working at all. (Please ignore the local tyrants of Li Tai)

Figure Luxuriance's line, the turbine smoothed daily

However, with the progress of computer performance, especially in recent years, the development of GPU technology, many traditional CPU load heavy task has been improved. For subdivision smoothing, the small partner using 3dsmax starts with the 2016 version, with a new option, that is Opensubdiv, which is a new modifier, and setting parameters is fairly straightforward.

In the modifier list, you can find the subdivision surface under the classification

This opensubdiv, in fact, is open subdivision surface abbreviation, open is opened, open source, subdivision surface is the meaning of grid subdivision, simple to understand is an open-source grid subdivision technology.

It was developed jointly by the famous Fox Animation Company and Microsoft, and Opensubdiv can use the GPU to accelerate the smooth computing process compared to traditional modeling methods or NURBS modeling.

Same subdivision level (the number of faces is consistent), top view and perspective, two pyramid different smoothing algorithm appearance difference

is not the feeling except a big one small is not what difference? It's no different. In normal CPU mode, the subdivision level can be controlled manually by the user.

Now we switch the "run mode" to the GPU display

At this point, the following tab "Adaptive Subdivision" becomes available, and the shadow of the model in the scene changes.

Left, Opensubdiv grid output right, opensubdiv GPU display

I am a good boy, the wind is completely different? and comes with anti-aliasing.

We then turn on the optional "adaptive" switch below.

Figure left, turn on GPU and adaptive opensubdiv modifier right, turbo smoothing modifier

Instant explosion! Don't panic, this is not your 3DSMAX error, but the effect of opensubdiv modifier. In fact, in the new Opensubdiv modifier, as long as you enable the GPU mode and adaptive subdivision, the model will be based on your viewport scaling values for automatic segmentation, and the entire process is carried out in the GPU, completely do not slide the mouse card explosion situation. And does not affect the final output to the renderer or the effect of the export!

In this way, we can handle more complex smooth meshes or animated scenes in the 3DSMAX, and when fine-tuning is needed, you only need to zoom in to see them.

It is worth mentioning that this can only be used for the latest nitrous Direct3D 11 viewport mode, when you run in other viewport mode, this function is invalid.

And this modifier in the GPU adaptive mode, in the viewport will disrupt the model's original Uvs, but does not affect the final rendering effect

Render test Sagenta model, Opensubdiv grid output, right opensubdiv GPU mode

In the actual modeling, we can open the final result preview mode, with the Opensubdiv modifier's GPU adaptive mode, more accurate and efficient adjustment of the model after the effect of segmentation.

When dealing with mechanical models, or models with hard edges, you can adjust the amount of crease in the line in an editable polygon to control the hardness of the boundary.

OK, today's skills are recorded here, spit a bit more, and I hope you don't think I'm wordy

Notes on the Opensubdiv subdivision function in 3DSMAX