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Bruno

quake movement

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Hello I have a problem I'' tryng to implement a movement similar to quake, half-life and family, but i need help. In this case, when the player press forward or back, i make a translation of 10 or -10 while the key is pressed, and it''s all fine. When i press the left or right key to rotate, the camera also rotates in the direction that i wan''t, but she rotates as if the camera was still in the origin(0,0,0). typedef struct{ float x; float y; float z; float xrot; float yrot; float zrot; }camera; camera look; when i press forward, i add the look.x 10 units when i press back i subtract look.x 10 units when i press left, i add the angle +10; when i press right i subtract the angle -10; glLoadIdentity(); glTranslatef(look.x,look.y,look.z); glRotatef(angle,0,look.yrot,0); If i make the translation first and then the rotation, the rotation works fine, but only if i still hadn''t pressed the forward button If i press the forward button first, and then the left or right, the rotation is not correct, he rotates as if the rotation was being made at the origin. Please advice Thanks Bruno

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Guest Anonymous Poster
You have to rotate first, then translate. All rotations happen around the origin, so if you translate before you rotate, instead of rotating in place, you make a wide arc around the origin...

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You should move the player/camera like this:

forward:
pos.x -= deltatime*speed*sin(angle);
pos.z -= deltatime*speed*cos(angle);

Then set up your modelview matrix like this

glLoadIdentity();
glTranslatef(-pos.x,-pos.y,-pos.z);
glRotatef(-angle,0,1,0);

(Sorry about the short answer, but I''m tired right now.)



- WitchLord

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