3DSIMED exported gmt file sizes

mantasisg

mantasisg

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Does anyone know whats about gmt files sizes that 3DSIMED exports ? They often looks to me like they are 2x, 5x or even 10x too large ? Anyone has any experience about it, maybe there is some issue about it, any tips how to keep things in check ?

I also notice that if I export gmts to fbx, open them up in blender, and then re-export to fbx, then they get even larger ? Is it normal, or I miss something ?

Perhaps you know something about this, @svictor ?
 
Depends on how and where those FBX models imported in blender, each objects may have different transformation retained. You can check transformation details by:
Press "N" in blender to open "Transform" panel on main view, then you can see all location/rotation/scale values on selected objects.

And those values may vary between different models that you imported from different source (such as that exported FBX from 3Dsimed or other APP). For example, several tracks I worked with have 90 degree rotation and 0.01 scale retained after models imported in blender.

Note, those rotation or scale value can also cause some common troubles (sometimes hard to notice) when work with blender modifiers, such as wrong XYZ direction or scale with object array and may require "apply transform" first.

If you build scratch model with 1.00 scale, then you will need to downscale by 0.01 on export as yashiman mentioned. Note, there is an "Apply Transform" check box which applies all object transformation before exporting, which may save you from some trouble in some cases. You can also save export setting to save your time and avoid forgetting later on.

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By the way people. I have not yet tried your suggestions. But just heads up, I am having trouble with file sizes going very large, not the model sizes. But I assume these things could be linked up.
 
mantasisg said:
By the way people. I have not yet tried your suggestions. But just heads up, I am having trouble with file sizes going very large, not the model sizes. But I assume these things could be linked up.
Click to expand...

I have had this, sometimes you can use the purge vertices option, but make sure that you look at the model with textures off and move the light around, because it can destroy/corrupt the normals. If you choose one of the smooth normals options (there are several) and check the file data reports, you can see how it sometimes bloats the number of vertices by a factor of three, depending on what you choose.
 
One of the causes of GMT size increase is from using "normal smooth" related function in 3dsimed (in Edit tab, there are 5 normal options), my usual way to avoid this issue is either:

Setup up 3D normal correctly in blender, and avoid using any normal options provided by 3dsimed. This way it ensures that 3D normal is preserved whether importing or exporting between 3dsimed & blender. You can also purge unwanted vertices in blender directly which is more effective, and could help avoid some issues.

If it is necessary to use any normal options from 3dsimed (such as "Point up" which I often use), you can partially avoid increasing in size by using "Purge > Purge Vertices" in 3dsimed immediately after applied any normal options (this is important, if purge is not done immediately but after file saved, then it may not be able to fully purge unwanted stuff, and file size may remain big).

Besides 3D normal, it could also be due to some mesh faces been made as double-sides, then they will inevitably result big file size (which is the worst case), and simple merging or purging won't work in this case.
 
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