mirror of
https://git.coom.tech/drummyfish/small3dlib.git
synced 2024-12-22 01:26:17 +01:00
227 lines
6.1 KiB
Python
227 lines
6.1 KiB
Python
# Python tool to convert a 3D model from the text obj format to C arrays to be
|
|
# used with small3dlib.
|
|
#
|
|
# by drummyfish
|
|
# released under CC0 1.0.
|
|
|
|
# NOTE: this script doesn't work with any OBJ file! If this doesn't work, the
|
|
# format is probably wrong. If you're exporting the OBJ from Blender, you may
|
|
# have to play around with the export options. Try this: unwrap model UVs
|
|
# (the script expects UV coords to exist), check "selection only", "apply
|
|
# modifiers", "include UVs", "triangulate faces", uncheck other things.
|
|
#
|
|
# Yes, I'll fix all this later :)
|
|
|
|
import sys
|
|
|
|
def printHelp():
|
|
print("Convert 3D model in OBJ format (text, triangulated) to C array for small3dlib.")
|
|
print("usage:\n")
|
|
print(" python obj2array.py [-c -sX -uY -vZ -n] file\n")
|
|
print(" -c compact format (off by default)")
|
|
print(" -t use direct instead of indexed UV coords (off by default)")
|
|
print(" -h include header guards (for model per file)")
|
|
print(" -m include a material array (per-triangle)")
|
|
print(" -nS use the name S for the model (defaut: \"model\")")
|
|
print(" -sX scale the model by X (default: 512)")
|
|
print(" -uY scale the U texture coord by Y (default: 512)")
|
|
print(" -vZ scale the V texture coord by Z (default: 512)")
|
|
print("");
|
|
print("by Miloslav \"drummyfish\" Ciz")
|
|
print("released under CC0 1.0")
|
|
|
|
if len(sys.argv) < 2:
|
|
printHelp()
|
|
quit()
|
|
|
|
FILENAME = ""
|
|
VERTEX_SCALE = 512
|
|
U_SCALE = 512
|
|
V_SCALE = 512
|
|
NAME = "model"
|
|
GUARDS = False
|
|
COMPACT = False
|
|
INDEXED_UVS = True
|
|
MATERIALS = False
|
|
|
|
for s in sys.argv:
|
|
if s == "-c":
|
|
COMPACT = True
|
|
elif s == "-t":
|
|
INDEXED_UVS = False
|
|
elif s == "-h":
|
|
GUARDS = True
|
|
elif s == "-m":
|
|
MATERIALS = True
|
|
elif s[:2] == "-s":
|
|
VERTEX_SCALE = int(s[2:])
|
|
elif s[:2] == "-u":
|
|
U_SCALE = int(s[2:])
|
|
elif s[:2] == "-v":
|
|
V_SCALE = int(s[2:])
|
|
elif s[:2] == "-n":
|
|
NAME = s[2:]
|
|
else:
|
|
FILENAME = s
|
|
|
|
objFile = open(FILENAME)
|
|
|
|
vertices = []
|
|
uvs = []
|
|
triangles = []
|
|
triangleUVs = []
|
|
materials = []
|
|
materialNames = []
|
|
|
|
currentMatrial = 0
|
|
|
|
def getMaterialIndex(materialName):
|
|
try:
|
|
return materialNames.index(materialName)
|
|
except Exception:
|
|
materialNames.append(materialName)
|
|
return len(materialNames) - 1
|
|
|
|
# parse the file:
|
|
|
|
for line in objFile:
|
|
if line[:2] == "v ":
|
|
coords = line[2:].split()
|
|
vertex = [float(coords[i]) for i in range(3)]
|
|
vertex[2] *= -1
|
|
vertices.append(vertex)
|
|
elif line[:3] == "vt ":
|
|
coords = line[3:].split()
|
|
vertex = [float(coords[i]) for i in range(2)]
|
|
vertex[1] = 1.0 - vertex[1]
|
|
uvs.append(vertex)
|
|
elif line[:2] == "f ":
|
|
indices = line[2:].split()
|
|
|
|
if len(indices) != 3:
|
|
raise(Exception("The model is not triangulated!"))
|
|
|
|
t = []
|
|
u = []
|
|
|
|
for i in indices:
|
|
components = i.split("/")
|
|
t.append(int(components[0]) - 1)
|
|
try:
|
|
u.append(int(components[1]) - 1)
|
|
except Exception as e:
|
|
u.append(int(components[2]) - 1)
|
|
|
|
triangles.append(t)
|
|
triangleUVs.append(u)
|
|
materials.append([currentMatrial])
|
|
elif line[:7] == "usemtl ":
|
|
currentMatrial = getMaterialIndex(line[7:])
|
|
|
|
# print the result:
|
|
|
|
def arrayString(name, array, components, scales, align, short, dataType, sizeStr):
|
|
result = "const " + dataType + " " + name + "[" + sizeStr + "] = {\n"
|
|
|
|
if COMPACT:
|
|
lineLen = 0
|
|
first = True
|
|
n = 0
|
|
|
|
for v in array:
|
|
for c in v:
|
|
item = ""
|
|
|
|
if first:
|
|
first = False
|
|
else:
|
|
result += ","
|
|
lineLen += 1
|
|
|
|
if lineLen >= 80:
|
|
result += "\n"
|
|
lineLen = 0
|
|
|
|
num = c * scales[n % len(scales)]
|
|
|
|
if short:
|
|
item += str(num)
|
|
else:
|
|
item += ("" if num >= 0 else "-") + "0x%x" % abs(num)
|
|
|
|
if lineLen + len(item) >= 80:
|
|
result += "\n"
|
|
lineLen = 0
|
|
|
|
result += item
|
|
lineLen += len(item)
|
|
n += 1
|
|
|
|
result += "};\n"
|
|
|
|
else: # non-compact
|
|
n = 0
|
|
endIndex = len(array) - 1
|
|
|
|
for v in array:
|
|
line = " " + ", ".join([str(int(v[c] * scales[c % len(scales)])).rjust(align) for c in range(components)])
|
|
|
|
if n < endIndex:
|
|
line += ","
|
|
|
|
line = line.ljust((components + 2) * (align + 1)) + "// " + str(n * components) + "\n"
|
|
result += line
|
|
n += 1
|
|
|
|
result += "}; // " + name + "\n"
|
|
|
|
return result
|
|
|
|
result = ""
|
|
|
|
if GUARDS:
|
|
print("#ifndef " + NAME.upper() + "_MODEL_H")
|
|
print("#define " + NAME.upper() + "_MODEL_H\n")
|
|
|
|
print("#define " + NAME.upper() + "_VERTEX_COUNT " + str(len(vertices)))
|
|
print(arrayString(NAME + "Vertices",vertices,3,[VERTEX_SCALE],5,False,"S3L_Unit",NAME.upper() + "_VERTEX_COUNT * 3"))
|
|
|
|
print("#define " + NAME.upper() + "_TRIANGLE_COUNT " + str(len(triangles)))
|
|
print(arrayString(NAME + "TriangleIndices",triangles,3,[1],5,True,"S3L_Index",NAME.upper() + "_TRIANGLE_COUNT * 3"))
|
|
|
|
if MATERIALS:
|
|
print(arrayString(NAME + "Materials",materials,1,[1],5,True,"uint8_t",NAME.upper() + "_TRIANGLE_COUNT"))
|
|
|
|
if INDEXED_UVS:
|
|
print("#define " + NAME.upper() + "_UV_COUNT " + str(len(uvs)))
|
|
print(arrayString(NAME + "UVs",uvs,2,[U_SCALE,V_SCALE],5,False,"S3L_Unit",NAME.upper() + "_UV_COUNT * 2"))
|
|
print("#define " + NAME.upper() + "_UV_INDEX_COUNT " + str(len(triangleUVs)))
|
|
print(arrayString(NAME + "UVIndices",triangleUVs,3,[1],5,True,"S3L_Index",NAME.upper() + "_UV_INDEX_COUNT * 3"))
|
|
else:
|
|
uvs2 = []
|
|
for item in triangleUVs:
|
|
uvs2.append([
|
|
uvs[item[0]][0],
|
|
uvs[item[0]][1],
|
|
uvs[item[1]][0],
|
|
uvs[item[1]][1],
|
|
uvs[item[2]][0],
|
|
uvs[item[2]][1]])
|
|
|
|
print("#define " + NAME.upper() + "_DIRECT_UV_COUNT " + str(len(uvs2)))
|
|
print(arrayString(NAME + "DirectUVs",uvs2,6,[U_SCALE,V_SCALE],5,False,"S3L_Unit",NAME.upper() + "_DIRECT_UV_COUNT * 6"))
|
|
|
|
print("S3L_Model3D " + NAME + "Model;\n")
|
|
|
|
print("void " + NAME + "ModelInit()")
|
|
print("{")
|
|
print(" S3L_model3DInit(")
|
|
print(" " + NAME + "Vertices,")
|
|
print(" " + NAME.upper() + "_VERTEX_COUNT,")
|
|
print(" " + NAME + "TriangleIndices,")
|
|
print(" " + NAME.upper() + "_TRIANGLE_COUNT,")
|
|
print(" &" + NAME + "Model);")
|
|
print("}")
|
|
|
|
if GUARDS:
|
|
print("\n#endif // guard")
|