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Difference between revisions of "v0.34 Talk:Obsidian"
UristDaVinci (talk | contribs) (Comment regarding obsidian sword bug and easy realistic fix.) |
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Its very likely that the wood is used for both the handle and the blade, with the obsidian flaked in long pieces and set in the wooden blade. A weapon like this was used by the aztecs. {{unsigned|Dianetics}} | Its very likely that the wood is used for both the handle and the blade, with the obsidian flaked in long pieces and set in the wooden blade. A weapon like this was used by the aztecs. {{unsigned|Dianetics}} | ||
:It has been known for years that rock swords are intended to be [http://en.wikipedia.org/wiki/Macahuitl these]; in Dwarf Fortress, though, it just treats the item as a sword made entirely of Obsidian because items cannot be made of multiple materials. Also, please sign your comments. --[[User:Quietust|Quietust]] 12:40, 15 April 2012 (UTC) | :It has been known for years that rock swords are intended to be [http://en.wikipedia.org/wiki/Macahuitl these]; in Dwarf Fortress, though, it just treats the item as a sword made entirely of Obsidian because items cannot be made of multiple materials. Also, please sign your comments. --[[User:Quietust|Quietust]] 12:40, 15 April 2012 (UTC) | ||
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| + | There is a bug currently with obsidian swords [http://www.bay12games.com/dwarves/mantisbt/view.php?id=5346 here]. I verifed that this bug still exists in 0.34.11 by adding IS_METAL to obsidian to permit the creation of obsidian swords in the arena. I also verified that adding glass-like SHEAR values to obsidian permits swords to cut up creatures rather than clubbing them. | ||
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| + | I found a research thesis online in which the material properties of obsidian were [http://dc.library.okstate.edu/utils/getfile/collection/theses/id/2594/filename/2595.pdf tested]. Note the biaxial strength (in this case, tensile stress in both directions) of 35 ± 6.7 MPa for black obsidian. This would be equivalent to [TENSILE_FRACTURE:35000]. More importantly, setting the shear values would permit effective weapon usage, i.e: | ||
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| + | [SHEAR_YIELD:35000] | ||
| + | [SHEAR_FRACTURE:35000] | ||
| + | [SHEAR_STRAIN_AT_YIELD:114] shear modulus 30.7 GPa | ||
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| + | For comparison, green glass is currently this in DF: | ||
| + | [SHEAR_YIELD:33000] | ||
| + | [SHEAR_FRACTURE:33000] | ||
| + | [SHEAR_STRAIN_AT_YIELD:113] | ||
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| + | --[[User:UristDaVinci|UristDaVinci]] 05:28, 30 June 2012 (UTC) | ||
Revision as of 05:28, 30 June 2012
Its very likely that the wood is used for both the handle and the blade, with the obsidian flaked in long pieces and set in the wooden blade. A weapon like this was used by the aztecs. – unsigned comment by Dianetics
- It has been known for years that rock swords are intended to be these; in Dwarf Fortress, though, it just treats the item as a sword made entirely of Obsidian because items cannot be made of multiple materials. Also, please sign your comments. --Quietust 12:40, 15 April 2012 (UTC)
There is a bug currently with obsidian swords here. I verifed that this bug still exists in 0.34.11 by adding IS_METAL to obsidian to permit the creation of obsidian swords in the arena. I also verified that adding glass-like SHEAR values to obsidian permits swords to cut up creatures rather than clubbing them.
I found a research thesis online in which the material properties of obsidian were tested. Note the biaxial strength (in this case, tensile stress in both directions) of 35 ± 6.7 MPa for black obsidian. This would be equivalent to [TENSILE_FRACTURE:35000]. More importantly, setting the shear values would permit effective weapon usage, i.e:
[SHEAR_YIELD:35000] [SHEAR_FRACTURE:35000] [SHEAR_STRAIN_AT_YIELD:114] shear modulus 30.7 GPa
For comparison, green glass is currently this in DF: [SHEAR_YIELD:33000] [SHEAR_FRACTURE:33000] [SHEAR_STRAIN_AT_YIELD:113]
--UristDaVinci 05:28, 30 June 2012 (UTC)