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Output size | Substance 3D Designer

Output size

It's the first of a graph's Base parameters and, along with the Output Format (or bitdepth), is critical to understand well since it has a large impact on a graph's output, both within Designer and in other applications as a published Substance 3D asset (SBSAR) file.

Tip:

We strongly recommend acquiring a good understanding of inheritance in Substance graphs as a foundation for using the Output Size property efficiently.

Note:

Use the lock button to have the Height value match the Width value.

In this page


Power of 2 values

The Output size parameter determines the resolution of the texture output by a graph or node.

A texture which is an object in graphics computing bound by some restrictions imposed by the way graphics processing hardware performs its computations. One of these restrictions is the texture should represent an image which pixel count in X and Y is a power of two.

Power of 2

Pixels

7

128

8

256

9

512

10

1024

11

2048

12

4096

13

8192

The Output size property uses logarithmic steps to easily map increases of powers of two (e.g., 256, 512, 1024, ...) to a linear scale (e.g. 8, 9, 10, ...). This means increasing or decreasing the Output Size value in X or Y by 1 is akin to multiplying or dividing the current resolution by 2.

This also applies when the Output Size value is controlled by a function, where the function should output the target logarithmic values (relative or absolute) instead of the target resolution.

Caution:

Increasing or decreasing resolution in both X and Y multiplies or divides the pixel count by 4, which has a significant impact on a graph's performance and memory footprint.
As such, we strongly recommend using the lowest resolution actually needed to get a desired result. Keeping resolutions under control is one of many of our performance optimization guidelines.

Note:

In Function graphs, the $size and $sizelog2 system variables return a Float2 value matching the current resolution of the node or graph as a raw pixel count or power of two respectively.
E.g., for a 1024*512 image, $size returns (1024,512) while $sizelog2 returns (10,9).


Relative size

When the Output Size property uses a Relative to... inheritance method, its value is expressed as a modifier relatively to the inherited logarithmic value.

Modifiers relative to the inherited resolution range from -12 to +12 on a logarithmic scale, with the default being 0. This means each step above or below results in doubling or halving of resolution. The table on the right gives an example of how relative resolution changes in one dimension for an inherited value of 9 (i.e., 512 = 2^9) and 11 (i.e., 2048 = 2^11):

Notice how above 8196, the size is capped. This cap is controlled by the Cooking Size Limit setting in the General section of the Preferences. Please note working with very large resolutions comes with a proportional performance cost and exponential memory footprint. Also, limits in graphics processing puts a hard limit on the maximum size of a texture.

-5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5
16 32 64 128 256 512 1024 2048 4096 8196 8196
64 128 256 512 1024 2048 4096 8196 8196 8196 8196
Note:

Below 16 the resolution is not capped but it is not recommended to go lower, as there are no performance gains below that threshold. To the contrary, performance actually drops because of the specific implementation of the Substance engine. Therefore, use 16x16 as a general minimum resolution in Substance graphs.


Changing the inheritance method

In most cases, the default inheritance method for the Output Size property is the following depending on the item:

Display the properties of a node or graph by clicking that item, then in the Properties panel find the Output Size property in the Base parameters section. Click the inheritance method drop down menu select the desired inheritance method.

Output size inheritance method


Example problems

If you are a new Adobe Substance 3D Designer user, you might run into some common problems. We'll list some examples below, along with solutions.

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