私はopenGl用の.objローダーを書いています。ジオメトリは正常に読み込まれますが、法線は常にめちゃくちゃです。2 つの異なるプログラムでモデルをエクスポートしようとしましたが、何も機能していないようです。私の知る限り、これはGL_TRIANGLESに法線を入れる方法です
glNormal3fv(norm1);
glVertex3fv(vert1);
glNormal3fv(norm2);
glVertex3fv(vert2);
glNormal3fv(norm3);
glVertex3fv(vert3);
(法線はコードの残りの部分で GLfloats を参照しています。)
編集: これは法線が壊れた等面体の写真です
これは完全な obj ローダー コードとファイルです。
void loadOBJFromFile(NSString *path,float movex,float movey)
{
NSString *contentns = [[NSString alloc]initWithContentsOfFile:path encoding:NSASCIIStringEncoding error:NULL];
NSArray *pieces = [contentns componentsSeparatedByString:@"#"];
//creating the arrays to read the vertecies and normals from.
NSArray *normals = [[pieces objectAtIndex:3]componentsSeparatedByString:@"\n"];
NSArray *vertecies = [[pieces objectAtIndex:2]componentsSeparatedByString:@"\n"];
//The +1 is to make sure we ignore the texture/ material definition that vomes before the faces.
int normalCount = [[normals objectAtIndex:0]intValue]+2;
int faceCount = [[normals objectAtIndex:normalCount]intValue];
//glTranslatef(movex, 0, movey);
glBegin(GL_TRIANGLES);
{
for (int i = 0; i < faceCount;i++)
{
//aquires all the numbers in thye current face.
NSArray *currentFace = [[normals objectAtIndex:normalCount+i+1]componentsSeparatedByString:@" "];
NSArray *v1 = [[currentFace objectAtIndex:1]componentsSeparatedByString:@"//"];
NSArray *v2 = [[currentFace objectAtIndex:2]componentsSeparatedByString:@"//"];
NSArray *v3 = [[currentFace objectAtIndex:3]componentsSeparatedByString:@"//"];
//crewatres the arrays to contain the vertecies
NSArray *vertex1 = [[vertecies objectAtIndex:[[v1 objectAtIndex:1]intValue]]componentsSeparatedByString:@" "];
NSArray *vertex2 = [[vertecies objectAtIndex:[[v2 objectAtIndex:1]intValue]]componentsSeparatedByString:@" "];
NSArray *vertex3 = [[vertecies objectAtIndex:[[v3 objectAtIndex:1]intValue]]componentsSeparatedByString:@" "];
//creates all the arrays for the normals
NSArray *normal1 = [[normals objectAtIndex:[[v1 objectAtIndex:1]intValue]]componentsSeparatedByString:@" "];
NSArray *normal2 = [[normals objectAtIndex:[[v2 objectAtIndex:1]intValue]]componentsSeparatedByString:@" "];
NSArray *normal3 = [[normals objectAtIndex:[[v3 objectAtIndex:1]intValue]]componentsSeparatedByString:@" "];
//creates the vertecies coordinates
GLfloat vert1[] = {[[vertex1 objectAtIndex:1]floatValue],[[vertex1 objectAtIndex:2]floatValue],[[vertex1 objectAtIndex:3]floatValue]};
GLfloat vert2[] = {[[vertex2 objectAtIndex:1]floatValue],[[vertex2 objectAtIndex:2]floatValue],[[vertex2 objectAtIndex:3]floatValue]};
GLfloat vert3[] = {[[vertex3 objectAtIndex:1]floatValue],[[vertex3 objectAtIndex:2]floatValue],[[vertex3 objectAtIndex:3]floatValue]};
//creates the normals coordinates
GLfloat norm1[] = {[[normal1 objectAtIndex:1]floatValue],[[normal1 objectAtIndex:2]floatValue],[[normal1 objectAtIndex:3]floatValue]};
GLfloat norm2[] = {[[normal2 objectAtIndex:1]floatValue],[[normal2 objectAtIndex:2]floatValue],[[normal2 objectAtIndex:3]floatValue]};
GLfloat norm3[] = {[[normal3 objectAtIndex:1]floatValue],[[normal3 objectAtIndex:2]floatValue],[[normal3 objectAtIndex:3]floatValue]};
glNormal3fv(norm1);
glVertex3fv(vert1);
glNormal3fv(norm2);
glVertex3fv(vert2);
glNormal3fv(norm3);
glVertex3fv(vert3);
}}
glEnd();
}
obj ファイル:
#Wavefront OBJ file created by Hexagon 2
mtllib object.mtl
g Form0
usemtl def_surf_mat
# 12
v -12.533 4.78719 0
v -12.533 20.2788 0
v -7.74583 12.533 -12.533
v -7.74583 12.533 12.533
v 0 0 -7.74583
v 0 0 7.74583
v 0 25.066 -7.74583
v 0 25.066 7.74583
v 7.74583 12.533 -12.533
v 7.74583 12.533 12.533
v 12.533 4.78719 0
v 12.533 20.2788 0
# 12
vn -0.850651 -0.525731 0
vn -0.850651 0.525731 1.50014e-08
vn -0.525731 -1.50014e-08 -0.850651
vn -0.525731 0 0.850651
vn 1.50014e-08 -0.850651 -0.525731
vn -1.50014e-08 -0.850651 0.525731
vn -1.50014e-08 0.850651 -0.525731
vn 1.50014e-08 0.850651 0.525731
vn 0.525731 0 -0.850651
vn 0.525731 7.5007e-09 0.850651
vn 0.850651 -0.525731 1.50014e-08
vn 0.850651 0.525731 -1.50014e-08
usemtl def_surf_mat
20
f 7//7 8//8 12//12
f 7//7 2//2 8//8
f 8//8 4//4 10//10
f 6//6 10//10 4//4
f 7//7 9//9 3//3
f 5//5 3//3 9//9
f 6//6 5//5 11//11
f 6//6 1//1 5//5
f 1//1 4//4 2//2
f 1//1 2//2 3//3
f 12//12 11//11 9//9
f 12//12 10//10 11//11
f 2//2 4//4 8//8
f 10//10 12//12 8//8
f 12//12 9//9 7//7
f 3//3 2//2 7//7
f 3//3 5//5 1//1
f 4//4 1//1 6//6
f 9//9 11//11 5//5
f 11//11 10//10 6//6