40 lines
1 KiB
C#
40 lines
1 KiB
C#
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using UnityEngine;
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public class Scissor : MonoBehaviour
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{
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public Rect scissorRect = new Rect(0f, 0f, 1f, 1f);
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public void SetRectangle(Rect rect)
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{
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scissorRect = rect;
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}
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private void SetScissorRect(Camera cam, Rect r)
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{
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if (r.x < 0f)
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{
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r.width += r.x;
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r.x = 0f;
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}
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if (r.y < 0f)
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{
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r.height += r.y;
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r.y = 0f;
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}
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r.width = Mathf.Min(1f - r.x, r.width);
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r.height = Mathf.Min(1f - r.y, r.height);
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cam.rect = new Rect(0f, 0f, 1f, 1f);
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cam.ResetProjectionMatrix();
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Matrix4x4 projectionMatrix = cam.projectionMatrix;
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cam.rect = r;
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Matrix4x4 matrix4x = Matrix4x4.TRS(new Vector3(1f / r.width - 1f, 1f / r.height - 1f, 0f), Quaternion.identity, new Vector3(1f / r.width, 1f / r.height, 1f));
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Matrix4x4 matrix4x2 = Matrix4x4.TRS(new Vector3((0f - r.x) * 2f / r.width, (0f - r.y) * 2f / r.height, 0f), Quaternion.identity, Vector3.one);
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cam.projectionMatrix = matrix4x2 * matrix4x * projectionMatrix;
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}
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private void OnPreRender()
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{
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SetScissorRect(base.camera, scissorRect);
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}
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}
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