97 lines
3.0 KiB
C#
97 lines
3.0 KiB
C#
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// Copyright 2017 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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using UnityEngine;
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using UnityEngine.EventSystems;
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using System.Collections;
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#if UNITY_2017_2_OR_NEWER
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using UnityEngine.XR;
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#else
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using XRSettings = UnityEngine.VR.VRSettings;
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#endif // UNITY_2017_2_OR_NEWER
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/// Helper functions to perform common math operations for Gvr.
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public static class GvrMathHelpers {
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public static Vector3 GetIntersectionPosition(Camera cam, RaycastResult raycastResult) {
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// Check for camera
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if (cam == null) {
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return Vector3.zero;
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}
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float intersectionDistance = raycastResult.distance + cam.nearClipPlane;
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Vector3 intersectionPosition = cam.transform.position + cam.transform.forward * intersectionDistance;
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return intersectionPosition;
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}
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public static Vector2 NormalizedCartesianToSpherical(Vector3 cartCoords) {
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cartCoords.Normalize();
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if (cartCoords.x == 0) {
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cartCoords.x = Mathf.Epsilon;
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}
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float polar = Mathf.Atan(cartCoords.z / cartCoords.x);
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if (cartCoords.x < 0) {
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polar += Mathf.PI;
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}
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float elevation = Mathf.Asin(cartCoords.y);
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return new Vector2(polar, elevation);
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}
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public static float EaseOutCubic(float min, float max, float value) {
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if (min > max) {
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Debug.LogError("Invalid values passed to EaseOutCubic, max must be greater than min. " +
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"min: " + min + ", max: " + max);
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return value;
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}
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value = Mathf.Clamp01(value);
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value -= 1.0f;
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float delta = max - min;
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float result = delta * (value * value * value + 1.0f) + min;
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return result;
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}
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/// Converts a float array of length 16 into a column-major 4x4 matrix.
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public static Matrix4x4 ConvertFloatArrayToMatrix(float[] floatArray) {
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Matrix4x4 result = new Matrix4x4();
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if (floatArray == null || floatArray.Length != 16) {
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throw new System.ArgumentException("floatArray must not be null and have a length of 16.");
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}
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result[0, 0] = floatArray[0];
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result[1, 0] = floatArray[1];
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result[2, 0] = floatArray[2];
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result[3, 0] = floatArray[3];
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result[0, 1] = floatArray[4];
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result[1, 1] = floatArray[5];
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result[2, 1] = floatArray[6];
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result[3, 1] = floatArray[7];
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result[0, 2] = floatArray[8];
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result[1, 2] = floatArray[9];
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result[2, 2] = floatArray[10];
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result[3, 2] = floatArray[11];
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result[0, 3] = floatArray[12];
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result[1, 3] = floatArray[13];
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result[2, 3] = floatArray[14];
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result[3, 3] = floatArray[15];
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return result;
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}
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}
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