#!/usr/bin/env python3
import pdb
import sys
# ABC = AB^AC
# (ABC^AJ).a = (j.c - j.b) a.a + (j.a - j.c) b.a + (j.b - j.a) c.a, for j = b or c
segment_fmt = "{j}a_aa"
plane_fmt = ""
edge_fmt = "{j}a * {b}a_{c}a + {j}{b} * {c}a_aa - {j}{c} * {b}a_aa"
# These checks must be negative and not positive, as in the cheat sheet.
# They are the same as in the cheat sheet, except that we consider (...).dot(A) instead of (...).dot(-A)
plane_tests = [ "C.dot (a_cross_b)", "D.dot(a_cross_c)", "-D.dot(a_cross_b)" ]
checks = plane_tests \
+ [ edge_fmt.format (**{'j':j,'b':"b",'c':"c"}) for j in [ "b", "c" ] ] \
+ [ edge_fmt.format (**{'j':j,'b':"c",'c':"d"}) for j in [ "c", "d" ] ] \
+ [ edge_fmt.format (**{'j':j,'b':"d",'c':"b"}) for j in [ "d", "b" ] ] \
+ [ segment_fmt.format(**{'j':j}) for j in [ "b", "c", "d" ] ]
checks_hr = [ "ABC.AO >= 0", "ACD.AO >= 0", "ADB.AO >= 0" ] \
+ [ "(ABC ^ {}).AO >= 0".format(n) for n in [ "AB", "AC" ] ] \
+ [ "(ACD ^ {}).AO >= 0".format(n) for n in [ "AC", "AD" ] ] \
+ [ "(ADB ^ {}).AO >= 0".format(n) for n in [ "AD", "AB" ] ] \
+ [ "AB.AO >= 0", "AC.AO >= 0", "AD.AO >= 0" ]
# weights of the checks.
weights = [ 2, ] * 3 + [ 3, ] * 6 + [ 1, ] * 3
# Segment tests first, because they have lower weight.
#tests = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ]
tests = [9, 10, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8, ]
assert len(tests) == len(checks)
assert sorted(tests) == list(range(len(tests)))
regions = [ "ABC", "ACD", "ADB", "AB", "AC", "AD", "A", "Inside", ]
cases = list(range(len(regions)))
# The following 3 lists refer to table doc/GJK_tetrahedra_boolean_table.ods
# A check ID is (+/- (index+1)) where a minus sign encodes a NOT operation
# and index refers to an index in list checks.
# definitions is a list of list of check IDs to be ANDed.
# For instance, a0.a3.!a4 -> [ 1, 4, -5]
definitions = [
[ 1, 4,- 5 ],
[ 2, 6,- 7 ],
[ 3, 8,- 9 ],
[- 4, 9, 10 ],
[- 6, 5, 11 ],
[- 8, 7, 12 ],
[-10,-11,-12 ],
[- 1,- 2,- 3 ],
]
# conditions is a list of (list of (list of check IDs to be ANDed) to be ORed).
conditions = [
[],
[],
[],
[],
[],
[],
[],
[ ], #[ [10, 11, 12], ], # I don't think this is always true...
]
# rejections is a list of (list of (list of check IDs to be ANDed) to be ORed).
rejections = [
[ [ 2, 6, 7], [ 3,- 8,- 9], ],
[ [ 3, 8, 9], [ 1,- 4,- 5], ],
[ [ 1, 4, 5], [ 2,- 6,- 7], ],
[ [- 1,- 3], ],
[ [- 2,- 1], ],
[ [- 3,- 2], ],
[ [ 4,- 5], [ 6,- 7], [ 8,- 9], ],
[],
]
implications = [
[ [ 4, 5, 10, ], [ 11],],
[ [ 6, 7, 11, ], [ 12],],
[ [ 8, 9, 12, ], [ 10],],
[ [- 4,- 5, 11, ], [ 10],],
[ [- 6,- 7, 12, ], [ 11],],
[ [- 8,- 9, 10, ], [ 12],],
[ [ 1, 4, 5, 6], [- 7] ],
[ [ 2, 6, 9, 8], [- 9] ],
[ [ 3, 8, 9, 4], [- 5] ],
[ [- 4, 5, 10,], [- 11] ],
[ [ 4,- 5,- 10,], [ 11] ],
[ [- 6, 7, 11,], [- 12] ],
[ [ 6,- 7,- 11,], [ 12] ],
[ [- 8, 9, 12,], [- 10] ],
[ [ 8,- 9,- 12,], [ 10] ],
[ [ 10, 3, 9, -12, 4, -5], [1] ],
[ [ 10, -3, 1, -4], [9] ],
[ [ 10, -3, -1, 2, -6, 11], [5] ],
[ [ -10, 11, 2, -12, -5, -1], [6] ],
[ [ -10,11,-2,1,5], [-6] ],
[ [-10,-11,12,1,-7,-2,4],[-5]],
[ [-10,-11,12,-3,2,7],[-8]],
[ [-10,-11,12,-3,-2],[-1]],
]
def set_test_values (current_tests, test_values, itest, value):
def satisfies (values, indices):
for k in indices:
if k > 0 and values[ k-1] != True : return False
if k < 0 and values[-k-1] != False: return False
return True
remaining_tests = list(current_tests)
next_test_values = list(test_values)
remaining_tests.remove (itest)
next_test_values[itest] = value
rerun = True
while rerun:
rerun = False
for impl in implications:
if satisfies(next_test_values, impl[0]):
for id in impl[1]:
k = (id - 1) if id > 0 else (-id-1)
if k in remaining_tests:
next_test_values[k] = (id > 0)
remaining_tests.remove(k)
rerun = True
else:
if next_test_values[k] != (id > 0):
raise ValueError ("Absurd case")
return remaining_tests, next_test_values
def set_tests_values (current_tests, test_values, itests, values):
for itest,value in zip(itests,values):
current_tests, test_values = set_test_values (current_tests, test_values, itest, value)
return current_tests, test_values
def apply_test_values (cases, test_values):
def canSatisfy (values, indices):
for k in indices:
if k > 0 and values[ k-1] == False: return False
if k < 0 and values[-k-1] == True : return False
return True
def satisfies (values, indices):
for k in indices:
if k > 0 and values[ k-1] != True : return False
if k < 0 and values[-k-1] != False: return False
return True
# Check all cases.
left_cases = []
for case in cases:
defi = definitions[case]
conds = conditions[case]
rejs = rejections[case]
if satisfies (test_values, defi):
# A definition is True, stop recursion
return [ case ]
if not canSatisfy (test_values, defi):
continue
for cond in conds:
if satisfies (test_values, cond):
# A condition is True, stop recursion
return [ case ]
append = True
for rej in rejs:
if satisfies (test_values, rej):
# A rejection is True, discard this case
append = False
break
if append: left_cases.append (case)
return left_cases
def max_number_of_tests (current_tests, cases, test_values = [None,]*len(tests), prevBestScore = float('inf'), prevScore = 0):
for test in current_tests:
assert test_values[test] == None, "Test " +str(test)+ " already performed"
left_cases = apply_test_values (cases, test_values)
if len(left_cases) == 1:
return prevScore, { 'case': left_cases[0], }
elif len(left_cases) == 0:
return prevScore, { 'case': None, 'comments': [ "applied " + str(test_values), "to " + ", ".join([regions[c] for c in cases ]) ] }
assert len(current_tests) > 0, "No more test but " + str(left_cases) + " remains"
currentBestScore = prevBestScore
bestScore = float('inf')
bestOrder = [None, None]
for i, test in enumerate(current_tests):
assert bestScore >= currentBestScore
currentScore = prevScore + len(left_cases) * weights[test]
#currentScore = prevScore + weights[test]
if currentScore > currentBestScore: # Cannot do better -> stop
continue
try:
remaining_tests, next_test_values = set_test_values (current_tests, test_values, test, True)
except ValueError:
remaining_tests = None
if remaining_tests is not None:
# Do not put this in try catch as I do not want other ValueError to be understood as an infeasible branch.
score_if_t, order_if_t = max_number_of_tests (remaining_tests, left_cases, next_test_values, currentBestScore, currentScore)
if score_if_t >= currentBestScore: # True didn't do better -> stop
continue
else:
score_if_t, order_if_t = prevScore, None
try:
remaining_tests, next_test_values = set_test_values (current_tests, test_values, test, False)
except ValueError:
remaining_tests = None
if remaining_tests is not None:
# Do not put this in try catch as I do not want other ValueError to be understood as an infeasible branch.
score_if_f, order_if_f = max_number_of_tests (remaining_tests, left_cases, next_test_values, currentBestScore, currentScore)
else:
score_if_f, order_if_f = prevScore, None
currentScore = max(score_if_t, score_if_f)
if currentScore < bestScore:
if currentScore < currentBestScore:
bestScore = currentScore
bestOrder = { 'test': test, 'true': order_if_t, 'false': order_if_f }
#pdb.set_trace()
currentBestScore = currentScore
if len(tests) == len(current_tests):
print ("New best score: {}".format(currentBestScore))
return bestScore, bestOrder
def printComments (order, indent, file):
if 'comments' in order:
for comment in order['comments']:
print (indent + "// " + comment, file=file)
def printOrder (order, indent = "", start=True,file=sys.stdout,curTests=[]):
if start:
print ("bool GJK::projectTetrahedraOrigin(const Simplex& current, Simplex& next)", file=file)
print ("{", file=file)
print (indent+"// The code of this function was generated using doc/gjk.py", file=file)
print (indent+"const vertex_id_t a = 3, b = 2, c = 1, d = 0;", file=file)
for l in "abcd":
print (indent+"const Vec3f& {} (current.vertex[{}]->w);".format(l.upper(),l), file=file)
print (indent+"const FCL_REAL aa = A.squaredNorm();".format(l), file=file)
for l in "dcb":
for m in "abcd":
if m <= l:
print (indent+"const FCL_REAL {0}{1} = {2}.dot({3});".format(l,m,l.upper(),m.upper()), file=file)
else:
print (indent+"const FCL_REAL& {0}{1} = {1}{0};".format(l,m), file=file)
print (indent+"const FCL_REAL {0}a_aa = {0}a - aa;".format(l), file=file)
for l0,l1 in zip("bcd","cdb"):
print (indent+"const FCL_REAL {0}a_{1}a = {0}a - {1}a;".format(l0,l1), file=file)
for l in "bc":
print (indent+"const Vec3f a_cross_{0} = A.cross({1});".format(l,l.upper()), file=file)
print("", file=file)
print( "#define REGION_INSIDE() "+indent+"\\", file=file)
print(indent+" ray.setZero(); \\", file=file)
print(indent+" next.vertex[0] = current.vertex[d]; \\", file=file)
print(indent+" next.vertex[1] = current.vertex[c]; \\", file=file)
print(indent+" next.vertex[2] = current.vertex[b]; \\", file=file)
print(indent+" next.vertex[3] = current.vertex[a]; \\", file=file)
print(indent+" next.rank=4; \\", file=file)
print(indent+" return true;", file=file)
print("", file=file)
if 'case' in order:
case = order['case']
if case is None:
print (indent + "// There are no case corresponding to this set of tests.", file=file)
printComments (order, indent, file)
print (indent + "assert(false);", file=file)
return
region = regions[case]
print (indent + "// Region " + region, file=file)
printComments (order, indent, file)
toFree = ['b', 'c', 'd']
if region == "Inside":
print (indent + "REGION_INSIDE()", file=file)
toFree = []
elif region == 'A':
print (indent + "originToPoint (current, a, A, next, ray);", file=file)
elif len(region)==2:
a = region[0]
B = region[1]
print (indent + "originToSegment (current, a, {b}, A, {B}, {B}-A, -{b}a_aa, next, ray);".format(
**{ 'b':B.lower(), 'B':B,} ), file=file)
toFree.remove(B.lower())
elif len(region)==3:
B = region[1]
C = region[2]
test = plane_tests[['ABC','ACD','ADB'].index(region)]
if test.startswith('-'): test = test[1:]
else: test = '-'+test
print (indent + "originToTriangle (current, a, {b}, {c}, ({B}-A).cross({C}-A), {t}, next, ray);".format(
**{'b':B.lower(), 'c':C.lower(), 'B':B, 'C':C, 't':test}), file=file)
toFree.remove(B.lower())
toFree.remove(C.lower())
else:
assert False, "Unknown region " + region
for pt in toFree:
print (indent + "free_v[nfree++] = current.vertex[{}];".format(pt), file=file)
else:
assert "test" in order and 'true' in order and 'false' in order
check = checks[order['test']]
check_hr = checks_hr[order['test']]
printComments (order, indent, file)
nextTests_t=curTests+["a"+str(order['test']+1),]
nextTests_f=curTests+["!a"+str(order['test']+1),]
if order['true'] is None:
if order['false'] is None:
print (indent + """assert(false && "Case {} should never happen.");""".format(check_hr))
else:
print (indent + "assert(!({} <= 0)); // Not {} / {}".format(check, check_hr, ".".join(nextTests_f)), file=file)
printOrder (order['false'], indent=indent, start=False, file=file, curTests=nextTests_f)
elif order['false'] is None:
print (indent + "assert({} <= 0); // {} / {}".format(check, check_hr, ".".join(nextTests_t)), file=file)
printOrder (order['true'], indent=indent, start=False, file=file, curTests=nextTests_t)
else:
print (indent + "if ({} <= 0) {{ // if {} / {}".format(check, check_hr, ".".join(nextTests_t)), file=file)
printOrder (order['true'], indent=indent+" ", start=False, file=file, curTests=nextTests_t)
print (indent + "}} else {{ // not {} / {}".format(check_hr, ".".join(nextTests_f)), file=file)
printOrder (order['false'], indent=indent+" ", start=False, file=file, curTests=nextTests_f)
print (indent + "}} // end of {}".format(check_hr), file=file)
if start:
print ("",file=file)
print ("#undef REGION_INSIDE", file=file)
print (indent+"return false;", file=file)
print ("}", file=file)
def unit_tests ():
# a4, a5, a10, a11, a12
cases = list(range(len(regions)))
pdb.set_trace()
left_cases = apply_test_values (cases,
test_values=[None,None,None,True,True,None,None,None,None,True,True,True])
assert len(left_cases) > 1
#unit_tests()
score, order = max_number_of_tests (tests, cases)
print(score)
printOrder(order, indent=" ")
# TODO add weights such that:
# - it is preferred to have all the use of one check in one branch.
# idea: ponderate by the number of remaining tests.