射线追踪法直达波ray tracing 试射法 c源代码
时间: 2023-09-24 15:00:52 浏览: 188
射线追踪法是一种计算机图形学中常用的算法,用于生成逼真的图像。直达波ray tracing 试射法是射线追踪算法的一种应用,可以模拟光线直接从光源射到物体表面上的效果。以下是一个简单的C源代码示例:
```c
#include <stdio.h>
typedef struct {
float x;
float y;
float z;
} Vector3;
typedef struct {
Vector3 origin;
Vector3 direction;
} Ray;
typedef struct {
Vector3 position;
Vector3 normal;
} Plane;
int intersectRayPlane(Ray ray, Plane plane, float* t) {
float denominator = plane.normal.x * ray.direction.x + plane.normal.y * ray.direction.y + plane.normal.z * ray.direction.z;
if (denominator == 0) {
return 0;
}
float numerator = plane.normal.x * (plane.position.x - ray.origin.x) + plane.normal.y * (plane.position.y - ray.origin.y) +
plane.normal.z * (plane.position.z - ray.origin.z);
*t = numerator / denominator;
if (*t >= 0) {
return 1;
}
return 0;
}
int main() {
Ray ray;
ray.origin.x = 0;
ray.origin.y = 0;
ray.origin.z = 0;
ray.direction.x = 1;
ray.direction.y = 0;
ray.direction.z = 0;
Plane plane;
plane.position.x = 5;
plane.position.y = 0;
plane.position.z = 0;
plane.normal.x = -1;
plane.normal.y = 0;
plane.normal.z = 0;
float t;
if (intersectRayPlane(ray, plane, &t)) {
printf("The ray intersects the plane at t = %f\n", t);
} else {
printf("The ray does not intersect the plane\n");
}
return 0;
}
```
以上代码示例定义了一个包含原点和方向的射线结构体`Ray`以及一个包含位置和法向量的平面结构体`Plane`。通过调用`intersectRayPlane`函数,可以判断射线和平面是否相交并计算相交点的参数`t`值。在示例中,射线的原点在坐标原点,方向为X轴正方向,平面的位置在X轴上5个单位处,法向量为X轴负方向。输出结果将显示射线是否与平面相交以及相交点的参数`t`值。
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