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Mapdev:height - Revision history
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mapdevinter>Flozi: 1cat
2013-03-20T20:13:23Z
<p>1cat</p>
<p><b>New page</b></p><div>= Height =<br />
The height of the terrain is generally defined with a greyscale displacement map with black representing the lowest point on the terrain and white the highest. The height of the terrain can also be modified in game via lua scripting. <br />
<center><br />
{| class="wikitable" <br />
|+ Example<br />
| [[File:Mapdev-height.png|256px]] || [[File:Mapdev-height-example.png]]<br />
|-<br />
! Example Height Map !! Ingame Result<br />
|}</center><br />
= Specification =<br />
== mapinfo.lua ==<br />
* [[Mapdev:mapinfo.lua]]<br />
<code><pre>local mapinfo = {<br />
...<br />
smf = {<br />
minHeight = 1000,<br />
maxHeight = -300,<br />
...<br />
},<br />
...<br />
}</pre></code><br />
=== minHeight and maxHeight ===<br />
Any values below zero are underwater, see [[Mapdev:water]]<br />
<br />
== Image File ==<br />
{| class="wikitable" width="100%"<br />
! width="15%" | File Location<br />
| The height map is an intermediary file compiled into the SMF/SMT files using [[MapConv]] or [[MapConvNG]].<br />
|-<br />
! File Format<br />
| Any that the Mapconv programs support<br />
|-<br />
! Colour Depth<br />
| 16bpp recommended, however 8bpp will work.<br />
|-<br />
! Channels<br />
| Greyscale<br />
|-<br />
! Resolution<br />
|<center><br />
{| class="wikitable" style="text-align: center;"<br />
! Spring Map Size<sup>*</sup><br />
! pixels = Spring Map Size * 64 + 1<br />
|-<br />
| 2<br />
| 129<br />
|-<br />
| 4<br />
| 257<br />
|-<br />
| 6<br />
| 385<br />
|-<br />
| ...<br />
| ...<br />
|-<br />
| 32<br />
| 2049<br />
|-<br />
| style="text-align: left;font-style:italic" colspan=2 | &#42; must be multiples of 2<br />
|}</center> <br />
|}<br />
<br />
=== 8 vs 16 bpp ===<br />
These two images show the differences in prescision that the bit depth of the image makes. The effect has been exaggerated here for clarity.<br />
<center><br />
{| class="wikitable" style="text-align: center;"<br />
| [[File:8bpp.png|256px]]<br />
|[[File:16bpp.png|256px]]<br />
|-<br />
! 8bpp<br />
! 16bpp<br />
|}<br />
</center><br />
<br />
=== +1 pixel ===<br />
When each pixel represents a vertex you need one extra pixel than the number of quads you are attempting to represent<br />
<br />
<center><br />
{| class="wikitable" style="text-align: center;"<br />
|+ Representation<br />
|[[File:Height_texture_map_vertex_example.png|384px|Example]]<br />
|}</center><br />
<br />
= Additional Information =<br />
== ROAM terrain engine ==<br />
* Official ROAM [http://www.cognigraph.com/ROAM_homepage/ page]<br />
* Gamasutra has a nice [http://www.gamasutra.com/view/feature/3188/realtime_dynamic_level_of_detail_.php article] on ROAM<br />
* various other [http://vterrain.org/LOD/Implementations/ implementations] of LOD terrain<br />
<br />
[[Category:Map Dev]]</div>
mapdevinter>Flozi