text does not render properly with scripts like devanagari #105875

New Issue

Raphael-Langerhorst · 2023-03-18T09:08:44+01:00

2023-03-18 09:08:44 +01:00

System Information
Operating system: Linux
Graphics card:

Blender Version
Broken: 3.3.4
Broken: blender-3.6.0-alpha+main.99506b3d733f-linux.x86_64-release
Worked: (newest version of Blender that worked as expected)

Short description of error

does not render devanagari text properly

Exact steps for others to reproduce the error
Open attached blend file, resources are packed, otherwise make sure you have kalimati font available in your system (apt-get install fonts-deva-extra)

I tried both to add a text object in 3D layout as well as in video editing. My requirement is mainly for video editing. I checked latest alpha and 3.3.4, both show the same behaviour. Please address this issue.

There are 2 issues in the supplied sample of "shanti" (peace translated to Nepali, use translate.google.com or something):

(1) the "n" character should be half and attach to the "t" (it has halant, indicating it is half).
(2) the i should be inserted BEFORE the last syllable.

Compare against the rendering of shanti in the screenshot with the kate text editor.

I am neither familiar with font rendering engines nor do I know the internals of Blender, but devanagari fonts have two characteristics:

In devanagari there are half characters that combine in many possible ways to syllables. Then some characters written after the syllable may need to appear before it, as in the example above. So a simple text engine will not do the job here. I have no idea how these things are encoded in a TTF font. In Latin every letter always stays same no matter what but this is not the case for devanagari (used in Hindi, Nepali and Sanskrit, among others).

**System Information** Operating system: Linux Graphics card: **Blender Version** Broken: 3.3.4 Broken: blender-3.6.0-alpha+main.99506b3d733f-linux.x86_64-release Worked: (newest version of Blender that worked as expected) **Short description of error** does not render devanagari text properly **Exact steps for others to reproduce the error** Open attached blend file, resources are packed, otherwise make sure you have kalimati font available in your system (apt-get install fonts-deva-extra) I tried both to add a text object in 3D layout as well as in video editing. My requirement is mainly for video editing. I checked latest alpha and 3.3.4, both show the same behaviour. Please address this issue. There are 2 issues in the supplied sample of "shanti" (peace translated to Nepali, use translate.google.com or something): (1) the "n" character should be half and attach to the "t" (it has halant, indicating it is half). (2) the i should be inserted BEFORE the last syllable. Compare against the rendering of shanti in the screenshot with the kate text editor. I am neither familiar with font rendering engines nor do I know the internals of Blender, but devanagari fonts have two characteristics: In devanagari there are half characters that combine in many possible ways to syllables. Then some characters written after the syllable may need to appear before it, as in the example above. So a simple text engine will not do the job here. I have no idea how these things are encoded in a TTF font. In Latin every letter always stays same no matter what but this is not the case for devanagari (used in Hindi, Nepali and Sanskrit, among others).

blender devanagari script error Screenshot_20230315_193727.png

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devanagari script render broken.blend

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blender devanagari script error Screenshot_20230318_133631.png

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Screenshot_20230318_134056.png

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blender devanagari script error Screenshot_20230315_193727.png

blender devanagari script error Screenshot_20230318_133631.png

Raphael-Langerhorst added the

labels 2023-03-18 09:08:44 +01:00

Jesse Yurkovich commented

2023-03-18 09:52:07 +01:00

This is a long-standing known issue that complex shaping scenarios for such languages are not yet implemented. Work has been done recently to better prepare for proper support, but there is still quite a bit of work remaining.

I'll mark this as a duplicate but feel free to subscribe to the following 2 tasks for updates on the matter: #100207 and #67452

This is a long-standing known issue that complex shaping scenarios for such languages are not yet implemented. Work has been done recently to better prepare for proper support, but there is still quite a bit of work remaining. I'll mark this as a duplicate but feel free to subscribe to the following 2 tasks for updates on the matter: #100207 and #67452

Jesse Yurkovich closed this issue

2023-03-18 09:52:08 +01:00

Blender Bot added

and removed

labels 2023-03-18 09:52:10 +01:00

Jesse Yurkovich added

Status

Duplicate