View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0005346 | Dwarf Fortress | Material Properties | public | 2012-02-20 19:07 | 2014-07-25 13:48 |
| Reporter | UristDaVinci | Assigned To | Toady One | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Platform | Toshiba Satellite | OS | Windows Vista | OS Version | Home SP2 |
| Product Version | 0.34.02 | ||||
| Fixed in Version | 0.40.05 | ||||
| Summary | 0005346: Obsidian swords always blunt, due to low SHEAR_YIELD | ||||
| Description | Obsidian swords made at the craftdwarf's workshop can't inflict slashing damage, instead acting like blunt clubs. In comparison, even elf wooden swords can cut skin. The reason this happens is because obsidian uses the default stone template values for combat cutting calculations: [SHEAR_YIELD:15000] used marble Wood has:[SHEAR_YIELD:40000] used pine Skin/muscle have:[SHEAR_YIELD:20000] used human skin Bone/nails/claws/teeth have: [SHEAR_YIELD:115000] As a result, teeth and wood can cut you, but blades of volcanic glass don't. I'd recommend setting obsidian to use the shear values similar to glass in order to make swords work as intended. | ||||
| Steps To Reproduce | Relevant forum posts/thread: http://www.bay12forums.com/smf/index.php?topic=91297.msg2541772#msg2541772 http://www.bay12forums.com/smf/index.php?topic=91297.msg2541922#msg2541922 Relevant for determining the intended function of the obsidian swords: http://en.wikipedia.org/wiki/Macuahuitl | ||||
| Tags | Probable Quick Fix | ||||
|
|
Bug also existed in 31.25 |
|
|
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 bruising them. I found a research thesis online in which the material properties of obsidian were tested: http://dc.library.okstate.edu/utils/getfile/collection/theses/id/2594/filename/2595.pdf . 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] 35 MPa [SHEAR_FRACTURE:35000] [SHEAR_STRAIN_AT_YIELD:114] shear modulus 30.7 GPa |
|
|
Bug still exists in 0.40.04 Despite obsidian being given a higher MAX_EDGE, it still can't cut as effectively as glass. The research thesis link in the post above still works. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2012-02-20 19:07 | UristDaVinci | New Issue | |
| 2012-02-20 19:10 | UristDaVinci | Note Added: 0020314 | |
| 2012-06-29 22:33 | UristDaVinci | Note Added: 0023127 | |
| 2014-07-23 20:36 | UristDaVinci | Note Added: 0027378 | |
| 2014-07-23 20:37 | UristDaVinci | Tag Attached: Probable Quick Fix | |
| 2014-07-23 20:48 |
|
Summary | Obsidian swords always blunt => Obsidian swords always blunt, due to low SHEAR_YIELD |
| 2014-07-25 13:48 | Toady One | Status | new => resolved |
| 2014-07-25 13:48 | Toady One | Fixed in Version | => Next Version |
| 2014-07-25 13:48 | Toady One | Resolution | open => fixed |
| 2014-07-25 13:48 | Toady One | Assigned To | => Toady One |
