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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"View matrix not accessible in shader by default","articleBody":"By default a few useful uniforms don't get set for a shader.\r\nThe defaults are: **MVP** (transform), **MV**, **P**, **(MV)^-1T** (normalMat) and **textureMat**.\r\n\r\nIn addition it would be useful to set the **view**, **viewInv** matrices and the **cameraPos** vector. \r\nFor example when working in world space (reflection/refraction with env mapping).\r\n\r\nIt is possible to set them manually:\r\n``` Java\r\npg = (PGraphicsOpenGL) this.g;\r\n...\r\nshader.set(\"view\", pg.camera);\r\nshader.set(\"viewInv\", pg.cameraInv);\r\nshader.set(\"cameraPos\", pg.modelviewInv.m03, pg.modelviewInv.m13, pg.modelviewInv.m23);\r\n```\r\n\r\nAnd then the **model** matrix can be calculated in the shader like this: viewInv * modelview \r\n\r\nI'm going to make the required changes during the next week.\r\nMy question is, how should I call them according to the conventions (alternative names)?\r\n\r\n\r\n\r\n","author":{"url":"https://github.com/Dawars","@type":"Person","name":"Dawars"},"datePublished":"2018-05-13T08:34:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/5504/processing/issues/5504"}