3D 자동차 오브젝트를 회전시킬 수 있습니까?

Question

OpenGL 또는 제 3 보조 도구를 사용하지 않고 회전 애니메이션을 사용할 수 있습니까? 고정 레이아웃에서 시계 방향으로 회전하는 3D 자동차 객체를 적용하고 싶습니다.

Answer 1

3D 자동차를 에뮬레이션하는 스프라이트 애니메이션 시퀀스가 ​​없다면 솔직히 어떻게 할 수 있는지 알지 못합니다. 나는 틀릴 수도 있지만 안드로이드에서 뭔가를 놓쳤을지도 모르지만 나에게 이것은 고전적인 openGL 상황이다.

스프라이트 애니메이션이란 애니메이션 계열의 gif와 같이 2D 시퀀스의 이미지를 의미합니다.

Answer 2

1) Well, you first have to set the car in 3D space; 
To model a 3D object, you must define all the vertices of the car as if you were modeling with points and after , linking this point you get the car in wireframe. 


Pont A {x = 3, y = 10, z = 8} 
Point B {x = 5, y = 12, z = 2} 
Point C {x = 6, y = 40, z = 6} 
Point D {x = 7, y = 12, z = 3} 
Point E {x = 3, y = 10, z = 8} 
... 

2) After modeling the car in points, you must define the links of points to form lines, there you have called wireframe modeling, if you want to modeling shapes is different, but with the wireframe already a good idea of the object in the real world. 

Line AB = Point A -> Point B 
Line BC = Point B -> Point C 


3) To spin perfectly the car, you should position it in the center of coordinates,applying in each point the formula translation T with measure the match the distance to the subject from the center at the origin of the axes. 

New point x: 
x = x - Tx 
New point y; 
y = y - Ty 
New point z: 
z = z - Tz 


4) With the car in position to spin it into an angle "g" should be applied to each point the rotation transformation, the formula is: 
  
Find the new point x: 
xt = (x * 1) (* y 0) (z * 0); 
Find the new point y: 
yt = (X * 0) (y * Math.cos (g)) (z * (Math.sin-(g))); 
Find the new point z: 
zt = (X * 0) (y * Math.sin (g)) (z * Math.cos (g)); 


5) After applying the rotation effect, you must return the object to its point of origin, making a reverse translation to step 3. 

New point x: 
x = Tx x 
New point y; 
y = y Ty 
New point z: 
z = z Tz 


This is a roughly explanation but is the most basic way, of course it has more complex formulas that are faster these changes, but to become more didactic I put this way.