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--- ofp:modeling:lod [2007-07-10 09:52]
127.0.0.1 external edit
+++ ofp:modeling:lod [2017-10-06 20:24] (current)
snakeman http to https switch.
@@ Line 2: / Line 2: @@
 What's a LOD?
-{{ http://tactical.nekromantix.com/images/wiki/LODs.gif}}
+{{https://pmc.editing.wiki/images/LODs.gif}}
 LOD means Level of Detail, and is a method of defining, via different variations of a model, how high or low the viewable quality of the model should be, and how it should interact with the environment.
 ====== <resolution> ======
-{{ http://tactical.nekromantix.com/images/wiki/Truck-ResLOD.jpg}}
+{{ https://pmc.editing.wiki/images/Truck-ResLOD.jpg}}
 Defines which model to use, depending on several, interdependent in-game conditions (view-distance, number of objects, video quality, CPU utilization, etc).
 This LOD shouldn't contain any empty Named Selections which are used in animations or by the game engine (wheels, etc), as that might cause the game to crash once the LOD becomes active.
-To demonstrate the complexity of the LOD selection, and the effect the resolution name has on LOD switching, a series of tests have been documented here: Resolution LOD Samples
+To demonstrate the complexity of the LOD selection, and the effect the resolution name has on LOD switching, a series of tests have been documented here: Resolution LOD Samples.
+If all your LODs (or if you only have one) are high polygon count, then your model will cause CPU slowdowns.
+===== Details =====
+Resolution Level Of Detail's (LOD) are nice things that make detailed objects close, look not so detailed from far away.
+VTE uses res lods of **0**, **1**, **2** and **4** for objects. Soldier models maybe **0.1**, **0.5**, **1**, **2** about, for weapons even smaller. VTE weapons try to use **0**, **0.7**, **1.5**, **2**, **2.5**, **3** resolution LODs.
+Resolution LOD in size of **12.0** or larger is not displayed at all in OFP.
+If **faces** are 50 or less, you only need a **0.0** resolution LOD.
+Vertex is the point, face is the side.
+BIS urges add-on makers to have a minimum of 5 LODs for objects. BIS themselves even use 6 LODs for bigger vehicles. If you have a highly detailed vehicle, you may want to use 7 LODs.
+<code>
+LOD A : ~7500 vertices
+LOD B : ~5000 vertices
+LOD C : ~2500 vertices
+LOD D : ~1500 vertices
+LOD E : ~700 vertices
+LOD F : ~300 vertices
+LOD G : ~100 vertices
+</code>
+BIS M2A2 model has the following resolution LODs:
+<code>
+LOD A (0.750): ~3400
+LOD B (1.5): ~1900
+LOD C (3): ~1100
+LOD D (5): ~560
+LOD E (7): ~375
+LOD F (9): ~175
+</code>
+LOD 9 is the lowest level of detail by definition.
+After some counting and comparing, this is what we came up with:\\
+Leopard LOD A : Quite more detail then the BIS M2A2. This is illustrated by the big difference in the number of vertices.\\
+Leopard LOD B : about the same as M2A2 LOD A\\
+Leopard LOD C : about the same as M2A2 LOD B\\
+Leopard LOD D : about the same as M2A2 LOD C\\
+Leopard LOD E : about the same as M2A2 LOD D\\
+Leopard LOD F : about the same as M2A2 LOD E\\
+Leopard LOD G : about the same as M2A2 LOD F
+Based on our observations, we will use the following values:\\
+Leopard LOD A : 0.50 (Almost half the value for the M2A2, because is has about twice the detail)\\
+Leopard LOD B : 0.75 (The same as the M2A2 LOD A)\\
+Leopard LOD C : 1.50 (The same as the M2A2 LOD B)\\
+Leopard LOD D : 3.00 (The same as the M2A2 LOD C)\\
+Leopard LOD E : 5.00 (The same as the M2A2 LOD D)\\
+Leopard LOD F : 7.00 (The same as the M2A2 LOD E)\\
+Leopard LOD G : 9.00 (The same as the M2A2 LOD F)
+Notice how the resolution values double for all values lower than 3. When the resolution value reaches 3, it is increased by steps of 2. Generally speaking, this means that the model detail halves whenever CPU load doubles. For lower details, declination in detail (and thus CPU load) decreases exponentially.
+If you have a vertex count that is very different from the BIS values, you can try to estimate a fitting resolution value for that LOD. Remember that more vertices = lower resolution value.
+For resolution values under 3, you should halve the resolution value each time you double the number of vertices. For resolution values over 3, subtract 2 each time you double the number of vertices. Performance-wise, lower resolution values increase system performance.
+BIS Values for LOD sizes
+<code>
+M1A1   : 0.750, 1.5, 3, 5, 6 and 7.
+M2A2   : 0.750, 1.5, 3, 5, 7 and 9.
+Truck5t: 0.750, 1.5, 3, 5, 7 and 9.
+BISmoto: 0.500, 1.5, 3, 5 and 7.
+BISbus : 0.500, 1.5, 3, 5, 7 and 9.
+BISkolo: 0.500, 1.5, 3, 5, 7 and 9.
+JeepMG : 0.750, 1.5, 3, 5 and 7.
+</code>
 ====== Geometry ======
-{{ http://tactical.nekromantix.com/images/wiki/Truck-GeoLOD.gif}}
+{{https://pmc.editing.wiki/images/Truck-GeoLOD.gif}}
-Defines where the model will collide with other objects.\\
-Should be //very// simple, and has to fulfil the following criteria in order to work:\\
+Defines where the model will collide with other objects. Should be //very// simple, and has to fulfil the following criteria in order to work:
-* Object must be Named Selection ComponentXX (where XX is a consecutive number between 01 and 99).\\
+  * Object must be Named Selection ComponentXX (where XX is a consecutive number between 01 and 99).
-* Must have 'Mass' (Alt-M).\\
+  * Must have 'Mass' (**ALT-M**).
-* Must be closed and convex (Validating Geometries).\\
+  * Must be closed and convex (Validating Geometries).
 Geometry objects should have a thickness of at least .5 meters in order to work properly.
 ====== Fire Geometry ======
-Defines where the model will collide with bullets & rockets.\\
+Defines where the model will collide with bullets & rockets. If this LOD is not present the Geometry LOD will be used instead.
-If this LOD is not present the Geometry LOD will be used instead.\\
-* Must be closed and convex (Validating Geometries).\\
 Proxies for the driver & passenger must be present into this LOD as well (they can be copied from the Resolution LOD). Otherwise the units will be invincible. One should also do any geometry validation ''before'' adding the proxies, otherwise they will not be functional.
+  * Must be closed and convex (Validating Geometries).
+  * The fire geometry and geometry LODs are to be made in very low polygon count.
+  * There is a limit of 128 (127?) Components.
 ====== Hit-points ======
@@ Line 61: / Line 145: @@
 ====== View - Cargo ======
-{{ http://tactical.nekromantix.com/images/wiki/Truck-View-Cargo.jpg}}
+{{ https://pmc.editing.wiki/images/Truck-View-Cargo.jpg}}
 What a cargo passenger can see of the model.

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