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Fix a quadstrip front/back-face inconsistancy.

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Only set front material colors to make it noticable if front/back-face
determination is incorrect anywhere.
This commit is contained in:
Brian 2007-12-14 17:34:01 -07:00
parent 9efa1029e5
commit 85f5e6d7b9
1 changed files with 12 additions and 7 deletions
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19
progs/demos/engine.c
View file

@ -441,8 +441,8 @@ DrawConnector(float length, float thickness,
for (i = 0; i <= 36; i++) {
const int j = i % 36;
glNormal3f(normals[j][0], normals[j][1], 0);
glVertex3f(points[j][0], points[j][1], z0);
glVertex3f(points[j][0], points[j][1], z1);
glVertex3f(points[j][0], points[j][1], z0);
}
glEnd();
}
@ -741,7 +741,7 @@ DrawEngine(const Engine *eng, float crankAngle)
glTranslatef(0, 0, -0.5 * crankLen);
/* crankshaft */
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, CrankshaftColor);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, CrankshaftColor);
glColor4fv(CrankshaftColor);
DrawPositionedCrankshaft(eng, crankAngle);
@ -760,12 +760,12 @@ DrawEngine(const Engine *eng, float crankAngle)
rot += k * eng->V_Angle;
/* piston */
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, PistonColor);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, PistonColor);
glColor4fv(PistonColor);
DrawPositionedPiston(eng, rot);
/* connecting rod */
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, ConnRodColor);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, ConnRodColor);
glColor4fv(ConnRodColor);
DrawPositionedConnectingRod(eng, rot);
glPopMatrix();
@ -780,7 +780,7 @@ DrawEngine(const Engine *eng, float crankAngle)
}
glEnable(GL_CULL_FACE);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, BlockColor);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, BlockColor);
glColor4fv(BlockColor);
if (eng->CrankList)
glCallList(eng->BlockList);
@ -1250,6 +1250,7 @@ Init(void)
{
const GLfloat lightColor[4] = { 0.7, 0.7, 0.7, 1.0 };
const GLfloat specular[4] = { 0.8, 0.8, 0.8, 1.0 };
const GLfloat backColor[4] = { 1, 1, 0, 0 };
Q = gluNewQuadric();
gluQuadricNormals(Q, GLU_SMOOTH);
@ -1261,10 +1262,14 @@ Init(void)
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColor);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 40);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
glMaterialf(GL_FRONT, GL_SHININESS, 40);
glMaterialfv(GL_FRONT, GL_SPECULAR, specular);
glEnable(GL_NORMALIZE);
glMaterialfv(GL_BACK, GL_DIFFUSE, backColor);
#if 0
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);
#endif
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
InitViewInfo(&View);