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标题: 求高手指点uv旋转如何以中心（0.5，0.5）为轴旋转 [打印本页]

作者: herry7x 时间: 2013-9-30 10:24
标题: 求高手指点uv旋转如何以中心（0.5，0.5）为轴旋转
下面这个脚本是uv旋转脚本，不过旋转的效果不是在中心，而是以左上角为中心旋转。求高人指点，下面的代码如何修改可以达到沿中心旋转的目的。

var rotateSpeed = 30;
var texture : Texture;

function Start() {
// Create a new material with a shader
// that rotates the texture. Texture rotation
// is performed with a _Rotation matrix.
var m : Material = new Material (
"Shader \"Rotating Texture\" {" +
"Properties { _MainTex (\"Base\", 2D) = \"white\" {} }" +
"SubShader {" +
" Pass {" +
" Material { Diffuse (1,1,1,0) Ambient (1,1,1,0) }" +
" Lighting On" +
" SetTexture [_MainTex] {" +
" matrix [_Rotation]" +
" combine texture * primary double, texture" +
" }" +
" }" +
"}" +
"}"
);
m.mainTexture = texture;
renderer.material = m;
}

function Update() {
// Construct a rotation matrix and set it for the shader
var rot = Quaternion.Euler (0, 0, Time.time * rotateSpeed);
var m = Matrix4x4.TRS (Vector3(0.5,0.5,0), rot, Vector3(1,1,1) );
renderer.material.SetMatrix ("_Rotation", m);

}

原始贴图.JPG (24.26 KB, 下载次数: 469)

原始贴图.JPG

3.JPG (24.94 KB, 下载次数: 457)

2.JPG (24.72 KB, 下载次数: 462)

1.JPG (24.23 KB, 下载次数: 502)

作者: herry7x 时间: 2013-9-30 11:17
搞定了！各位

代码在下面，给大家分享一下吧。

var rotateSpeed = 30;
var texture : Texture;

function Start() {
// Create a new material with a shader
// that rotates the texture. Texture rotation
// is performed with a _Rotation matrix.
var m : Material = new Material (
"Shader \"Rotating Texture\" {" +
"

roperties { _MainTex (\"Base\", 2D) = \"white\" {} }" +
"SubShader {" +
" Pass {" +
" Material { Diffuse (1,1,1,0) Ambient (1,1,1,0) }" +
" Lighting On" +
" SetTexture [_MainTex] {" +
" matrix [_Rotation]" +
" combine texture * primary double, texture" +
" }" +
" }" +
"}" +
"}"
);
m.mainTexture = texture;
renderer.material = m;
}

function Update() {
// Construct a rotation matrix and set it for the shader
var rot = Quaternion.Euler (0, 0, Time.time * rotateSpeed);
var m = Matrix4x4.TRS (Vector3(0.5,0.5,0), rot, Vector3(1,1,1) );
var n = Matrix4x4.TRS (Vector3(-0.5,-0.5,0), Quaternion.identity, Vector3(1,1,1) );
renderer.material.SetMatrix ("_Rotation", m*n);

}

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