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Earthview: Difference between revisions
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The main requirement (especially if custom hires textures are used) is available memory and GPU texture memory. All textures are split into eight tiles, four for the northern hemisphere (N1 to N4), and four for the southern hemisphere (S1 to S4) and each tile is loaded, or unloaded, according to visibility. As such, GPU memory is efficiently used and limited graphic card memory should not be an issue for the default texture size. However, the loading of a texture tile induces some bottleneck and FG may hang for a couple of seconds, or more (depending on tile resolution), while the texture appears. | The main requirement (especially if custom hires textures are used) is available memory and GPU texture memory. All textures are split into eight tiles, four for the northern hemisphere (N1 to N4), and four for the southern hemisphere (S1 to S4) and each tile is loaded, or unloaded, according to visibility. As such, GPU memory is efficiently used and limited graphic card memory should not be an issue for the default texture size. However, the loading of a texture tile induces some bottleneck and FG may hang for a couple of seconds, or more (depending on tile resolution), while the texture appears. | ||
Where this is feasible and supported by the GPU drivers, pre-compressed and mipmapped dds textures offer the fastest loading times. As such textures can not be used with many OpenSource graphics drivers, the default textures are not in dds format, but these can be generated along the lines discussed in the "Customization" section. For high-end graphic cards, it is possible to actually force the loading of all texture tiles at once when Earthview starts. This is triggered with the command line option: | Where this is feasible and supported by the GPU drivers, pre-compressed and mipmapped dds textures offer the fastest loading times. As such textures can not be used with many OpenSource graphics drivers, the default textures are not in dds format, but these can be generated along the lines discussed in the "Customization" section. | ||
For high-end graphic cards, it is possible to actually force the loading of all texture tiles at once when Earthview starts. This is triggered with the command line option: | |||
--prop:/earthview/show-force-all=true | --prop:/earthview/show-force-all=true | ||
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Most likely the easy way is no longer available, or you are curious. Chris_Blues made a wonderful Bash-script that will download the NASA images and do the texture generation for you, in the correct way. It is available on github, together with the instructions on how to use it: | Most likely the easy way is no longer available, or you are curious. Chris_Blues made a wonderful Bash-script that will download the NASA images and do the texture generation for you, in the correct way. It is available on github, together with the instructions on how to use it: | ||
[https://github.com/chris-blues/Nasa2FGearthview Nasa2FGearthview] | [https://github.com/chris-blues/Nasa2FGearthview Nasa2FGearthview] | ||
This program can generate world, clouds and | This program can generate world, clouds and normal maps with height data included in the alpha channel, and at various resolutions ranging from 1024x1024 to 16384x16384 pixels. | ||
* Remarks | * Remarks | ||