Difference between revisions of "C++:3D Exercises"

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(Normalise a vector)
(Cross Product)
Line 65: Line 65:
 
}
 
}
  
float *crossproduct(float a[3], float b[3]){
+
void crossproduct(float r[3],float a[3],float b[3]){
  float *r = new float[3];
+
   // Your code goes here, change the result - r
   // Your code goes here
 
  return r;
 
 
}
 
}
  
Line 75: Line 73:
 
   float A[]={1,0,1};
 
   float A[]={1,0,1};
 
   float B[]={1,1,2};
 
   float B[]={1,1,2};
   float *C = crossproduct(A,B);
+
   float C[3];
 +
  crossproduct(C,A,B);
 
   cout << C[0]<<" "<<C[1]<<" "<<C[2]<< endl;
 
   cout << C[0]<<" "<<C[1]<<" "<<C[2]<< endl;
 
   return 0;
 
   return 0;

Revision as of 12:03, 25 November 2011

Dot Product

Calculate the dot product of two vectors. Fill in the details in the function dotproduct

Wikipedia includes a good article on dot products. http://en.wikipedia.org/wiki/Dot_product#Definition



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Cross Product

Calculate the cross product of two vectors. Fill in the details in the function crossproduct

Wikipedia includes a good article on cross products. http://en.wikipedia.org/wiki/Cross_product#Coordinate_notation



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Vector Length

Calculate the magnitude of a vector. Fill in the details in the function length



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Normalise a vector

Normalise the given vector. The direction should be the same, the length should be 1.



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Normal to a plane

Find the unit normal to the plane that contains the three points given.



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