Add mods: technic, moreores, paintings, Nyancat (Pbj_pup). Small fix: sandwiches

mods/technic_plus_beta/technic/doc/processes.md

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+
+industrial processes
+--------------------
+
+### alloying ###
+
+In technic, alloying is a way of combining items to create other items,
+distinct from standard crafting.  Alloying always uses inputs of exactly
+two distinct types, and produces a single output.  Like cooking, which
+takes a single input, it is performed using a powered machine, known
+generically as an "alloy furnace".  An alloy furnace always has two
+input slots, and it doesn't matter which way round the two ingredients
+are placed in the slots.  Many alloying recipes require one or both
+slots to contain a stack of more than one of the ingredient item: the
+quantity required of each ingredient is part of the recipe.
+
+As with the furnaces used for cooking, there are multiple kinds of alloy
+furnace, powered in different ways.  The most-used alloy furnaces are
+electrically powered.  There is also an alloy furnace that is powered
+by directly burning fuel, just like the basic cooking furnace.  Building
+almost any electrical machine, including the electrically-powered alloy
+furnaces, requires a machine casing component, one ingredient of which
+is brass, an alloy.  It is therefore necessary to use the fuel-fired
+alloy furnace in the early part of the game, on the way to building
+electrical machinery.
+
+Alloying recipes are mainly concerned with metals.  These recipes
+combine a base metal with some other element, most often another metal,
+to produce a new metal.  This is discussed in the section on metal.
+There are also a few alloying recipes in which the base ingredient is
+non-metallic, such as the recipe for the silicon wafer.
+
+### grinding, extracting, and compressing ###
+
+Grinding, extracting, and compressing are three distinct, but very
+similar, ways of converting one item into another.  They are all quite
+similar to the cooking found in the basic Minetest game.  Each uses
+an input consisting of a single item type, and produces a single
+output.  They are all performed using powered machines, respectively
+known generically as a "grinder", "extractor", and "compressor".
+Some compressing recipes require the input to be a stack of more than
+one of the input item: the quantity required is part of the recipe.
+Grinding and extracting recipes never require such a stacked input.
+
+There are multiple kinds of grinder, extractor, and compressor.  Unlike
+cooking furnaces and alloy furnaces, there are none that directly burn
+fuel; they are all electrically powered.
+
+Grinding recipes always produce some kind of dust, loosely speaking,
+as output.  The most important grinding recipes are concerned with metals:
+every metal lump or ingot can be ground into metal dust.  Coal can also
+be ground into dust, and burning the dust as fuel produces much more
+energy than burning the original coal lump.  There are a few other
+grinding recipes that make block types from the basic Minetest game
+more interconvertible: standard stone can be ground to standard sand,
+desert stone to desert sand, cobblestone to gravel, and gravel to dirt.
+
+Extracting is a miscellaneous category, used for a small group
+of processes that just don't fit nicely anywhere else.  (Its name is
+notably vaguer than those of the other kinds of processing.)  It is used
+for recipes that produce dye, mainly from flowers.  (However, for those
+recipes using flowers, the basic Minetest game provides parallel crafting
+recipes that are easier to use and produce more dye, and those recipes
+are not suppressed by technic.)  Its main use is to generate rubber from
+raw latex, which it does three times as efficiently as merely cooking
+the latex.  Extracting was also formerly used for uranium enrichment for
+use as nuclear fuel, but this use has been superseded by a new enrichment
+system using the centrifuge.
+
+Compressing recipes are mainly used to produce a few relatively advanced
+artificial item types, such as the copper and carbon plates used in
+advanced machine recipes.  There are also a couple of compressing recipes
+making natural block types more interconvertible.
+
+### centrifuging ###
+
+Centrifuging is another way of using a machine to convert items.
+Centrifuging takes an input of a single item type, and produces outputs
+of two distinct types.  The input may be required to be a stack of
+more than one of the input item: the quantity required is part of
+the recipe.  Centrifuging is only performed by a single machine type,
+the MV (electrically-powered) centrifuge.
+
+Currently, centrifuging recipes don't appear in the unified\_inventory
+craft guide, because unified\_inventory can't yet handle recipes with
+multiple outputs.
+
+Generally, centrifuging separates the input item into constituent
+substances, but it can only work when the input is reasonably fluid,
+and in marginal cases it is quite destructive to item structure.
+(In real life, centrifuges require their input to be mainly fluid, that
+is either liquid or gas.  Few items in the game are described as liquid
+or gas, so the concept of the centrifuge is stretched a bit to apply to
+finely-divided solids.)
+
+The main use of centrifuging is in uranium enrichment, where it
+separates the isotopes of uranium dust that otherwise appears uniform.
+Enrichment is a necessary process before uranium can be used as nuclear
+fuel, and the radioactivity of uranium blocks is also affected by its
+isotopic composition.
+
+A secondary use of centrifuging is to separate the components of
+metal alloys.  This can only be done using the dust form of the alloy.
+It recovers both components of binary metal/metal alloys.  It can't
+recover the carbon from steel or cast iron.