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February 7, 2022 02:34
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Save SamyBencherif/9f342f2032b247b967a1ada9605ecf64 to your computer and use it in GitHub Desktop.
Adaptation of script from https://www.youtube.com/watch?v=82iBWIycU0o
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| using System.Collections; | |
| using System.Collections.Generic; | |
| using UnityEngine; | |
| [RequireComponent(typeof(Camera))] | |
| [ExecuteInEditMode] | |
| public class RaymarchCamera : MonoBehaviour | |
| { | |
| [SerializeField] | |
| public Shader _shader; | |
| public Material _raymarchMat; | |
| public Camera _cam; | |
| private void OnRenderImage(RenderTexture source, RenderTexture destination) | |
| { | |
| if (!_raymarchMat && _shader) | |
| { | |
| _raymarchMat = new Material(_shader); | |
| _raymarchMat.hideFlags = HideFlags.HideAndDontSave; | |
| } | |
| if (!_cam) | |
| { | |
| _cam = GetComponent<Camera>(); | |
| } | |
| if (!_raymarchMat) | |
| { | |
| Graphics.Blit(source, destination); | |
| return; | |
| } | |
| _raymarchMat.SetMatrix("_CamFrustum", CamFrustum(_cam)); | |
| _raymarchMat.SetMatrix("_CamToWorld", _cam.cameraToWorldMatrix); | |
| _raymarchMat.SetVector("_CamWorldSpace", _cam.transform.position); | |
| RenderTexture.active = destination; | |
| GL.PushMatrix(); | |
| GL.LoadOrtho(); | |
| _raymarchMat.SetPass(0); | |
| GL.Begin(GL.QUADS); | |
| // BL | |
| GL.MultiTexCoord2(0, 0.0f, 0.0f); | |
| GL.Vertex3(0.0f, 0.0f, 3.0f); | |
| // BR | |
| GL.MultiTexCoord2(0, 1.0f, 0.0f); | |
| GL.Vertex3(1.0f, 0.0f, 2.0f); | |
| // TR | |
| GL.MultiTexCoord2(0, 1.0f, 1.0f); | |
| GL.Vertex3(1.0f, 1.0f, 1.0f); | |
| // TL | |
| GL.MultiTexCoord2(0, 0.0f, 1.0f); | |
| GL.Vertex3(0.0f, 1.0f, 0.0f); | |
| GL.End(); | |
| GL.PopMatrix(); | |
| } | |
| private Matrix4x4 CamFrustum(Camera cam) | |
| { | |
| Matrix4x4 frustum = Matrix4x4.identity; | |
| float fov = Mathf.Tan((cam.fieldOfView * 0.5f) * Mathf.Deg2Rad); | |
| Vector3 goUp = Vector3.up * fov; | |
| Vector3 goRight = Vector3.right * fov * cam.aspect; | |
| Vector3 TL = (-Vector3.forward - goRight + goUp); | |
| Vector3 TR = (-Vector3.forward + goRight + goUp); | |
| Vector3 BR = (-Vector3.forward + goRight - goUp); | |
| Vector3 BL = (-Vector3.forward - goRight - goUp); | |
| frustum.SetRow(0, TL); | |
| frustum.SetRow(1, TR); | |
| frustum.SetRow(2, BR); | |
| frustum.SetRow(3, BL); | |
| return frustum; | |
| } | |
| } |
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