3D Space. Moving in it...?

Greg K · 2001-09-26T22:53:36

Ok, I have all these components- x, y, z Two angles, a and b Speed I need to move x, y, z in the rotated direction. a = angle YZ and b = angle XZ Y Z | / | / |a/b |/_______X This formula seemed to work. ( A and B start as angles ) // Convert angles to radians fA = DegToRad( fA ); fB = DegToRad( fB ); x -= (float)cos(fA)*fVel; z -= (float)sin(fA)*fVel; y += (float)sin(fB)*fVel; This works until angle B is within the range of 90-270. Then you go the wrong way. I hope this makes sense. I am not very good at explaining things. Basically, I need to know why this does not work in those ranges.

Math and Physics Programming

Started by Greg K September 23, 2001 03:13 PM

10 comments, last by Greg K 23 years, 4 months ago

Anonymous

September 26, 2001 07:23 PM

I''ve been working on a similar project and was wondering if anyone was able to get
something working using Jesper T''s solution?

IcarusXJ

Greg K

Author

122

September 26, 2001 10:52 PM

I did something different that solved my problem.

    float fx;float fy;float fz;float ft;	// DegToRad returns the radians of a degree (My func)// fTheta = horizontal rotation// fPhi = vertical rotationfTheta = (float)DegToRad( fTheta );fPhi = (float)DegToRad( fPhi );// FCOS & FSIN are just cos & sin with a (float) typecast.fx = FCOS(fTheta) * fVel;fz = FSIN(fTheta) * fVel;fy = FSIN(fPhi) * fVel;// This was my mistake. I just left out the other half of the vertical angleft = FCOS(fPhi);fx *= ft;fz *= ft;x -= fx;z -= fz;y += fy;

I don't know if this is mathematically correct but it works wonderfully.

Edited by - Greg K on September 26, 2001 11:53:36 PM

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3D Space. Moving in it...?

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3D Space. Moving in it...?

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