OpenGL 光照适用于 iPhone 4/iPad，不适用于 iPhone 3G
我在使用 OpenGL 1.1 光照时遇到问题。我的代码适用于 iPhone 4，但不适用于 iPhone 3G。一切看起来都没有被照亮（单色）。我没有 3GS，所以我不知道它是否适用于该机。
这是我的照明设置：
- (void)setupLighting
{
const GLfloat lightAmbient[] = {0.2, 0.2, 0.2, 1.0};
const GLfloat matAmbient[] = {0.6, 0.6, 0.6, 1.0};
const GLfloat matDiffuse[] = {1.0, 1.0, 1.0, 1.0};
const GLfloat matSpecular[] = {0.6, 0.6, 0.6, 0.1};
const GLfloat lightPosition[] = {0.0, 0.0, 0.0, 0.0};
const GLfloat lightShininess = 100.0;
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, matAmbient);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, matDiffuse);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, matSpecular);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, lightShininess);
glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient);
glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
glShadeModel(GL_SMOOTH);
NSLog(@"Lighting sorted");
}
之后我提供法线向量等，这在较新的 iPhone 上成功渲染......但是，我真的很想支持所有三款 iPhone。 （它也适用于 iPad）。
I am having trouble with OpenGL 1.1 lighting. My code works on the iPhone 4 but not the iPhone 3G. Everything appears unlit (flat colours). I don't have a 3GS so I can't find out if it works on that one or not.
Here is my lighting setup:
- (void)setupLighting
{
const GLfloat lightAmbient[] = {0.2, 0.2, 0.2, 1.0};
const GLfloat matAmbient[] = {0.6, 0.6, 0.6, 1.0};
const GLfloat matDiffuse[] = {1.0, 1.0, 1.0, 1.0};
const GLfloat matSpecular[] = {0.6, 0.6, 0.6, 0.1};
const GLfloat lightPosition[] = {0.0, 0.0, 0.0, 0.0};
const GLfloat lightShininess = 100.0;
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, matAmbient);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, matDiffuse);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, matSpecular);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, lightShininess);
glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient);
glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
glShadeModel(GL_SMOOTH);
NSLog(@"Lighting sorted");
}
I supply normal vectors and so on after that, which successfully renders on the newer iPhone... however, I would really like to support all three iPhones. (It also works on the iPad).
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呵呵，为了回答我自己的问题（并为其他有同样问题的人提供信息），灯光位置 (0, 0, 0, 0) 存在问题。将其设置为 (0, 0, -1.0, 0) 解决了该问题，并且不会干扰其他设备上的照明条件。我仍然不太明白我在这里做了什么，但我很高兴我可以提供对 iPhone 3G 的兼容性......
Heh, to answer my own question (and provide info for anyone else with the same problem) there was a problem with the light position being (0, 0, 0, 0). Setting it to (0, 0, -1.0, 0) fixed the problem and didn't disturb the lighting conditions on the other devices. I still don't quite understand what I've done here, but I'm just glad I can provide compatibility to iPhone 3Gs...